正确答案：A
Explain:
二．That与which/who的区别
(一) 指物时,that和 which可互换.但在下列情况下,一般用that而不用which
1. 先行词为all, little, much, everything, something, anything, nothing等不定代词时
A. Only a scientist could understand all (that) this pursuit (事业,消遣) meant.
B. I am sure she has something (that) you can borrow.
C. Everything (that) we saw was of great interest to us.
D. There is little (that) the enemy can do besides surrender.
E. He saw much that was bad.
F. Is there anything else (that) you require?
G. There is nothing in the world that can frighten the Chinese people.
H. There is still much that can be improved.
I. He did all/ everything/ anything (that) he can (do) to help us.
2. 先行词被all, little, much, every, some, any, no等修饰时
A. I’ve read all the books (that) you gave me.
B. You can take any seat that is free.
3. 先行词被形容词最高级或序数词修饰时
A. This is the first composition (that) he has written in English.
B. The smallest living things that can be seen under a microscope are bacteria.
C. This is the best novel (that) I ever read.
D. Light blue is the best color that suits her best.
E. This is the best film that has been shown this year.
F. He asked for the best book that was on the subject.
G. The first English novel (that) I read was written by Charles Dickens.
H. This is the most exciting football match (that) I have ever watched.
4. 先行词被the only, the very, the last修饰时
A. That white flower is the only one (that) I really like.
B. This is the very book (that) I want to find.
C. The last place (that) we visited was the chemical works.
D. The Great Wall is the last place (that) Mr. Smith is going to visit before he leaves Beijing.
E. Is oxygen the only gas that helps fire burn?
Note:如果先行词是人时,引导定语从句的关系代词不受以上情况的制约,用that或who (whom)均可
A. The first person (whom/ who/ that) I visited there was Mr. Smith
B. Mary is the only girl (whom/who/ that) John has ever loved.
5. 当有两个或两个以上分别表示人和物的先行词时(即先行词既有人又有物时)
A. He talked about the teachers and schools (that) he had visited.
B. The foreign guests spoke highly of the children and their shows (that) they saw in the kindergarten.
C. He told us about the things and persons that had interested him most when he stayed in France.
D. They talked for about half an hour of persons and things (that) they remembered at school.
6. 当主句是以who或which开头的特殊疑问句时 ，定语从句要用that而不用who(whom)和which引导。 （先行词既可以是人也可以是物）
A. Who is the person that is standing at the gate?
B. Which of us that knows something about physics does not know this?
C. Who is the man that called on you just now?
D. Which of the subjects (that) you are studying is the most difficult?
7. 当代替先行词的关系代词在从句中作表语时，先行词无论是人是物，引导词多用that
A. China is not the country that (= what) it was before.
B. She is not the girl that (=what) she was three years ago.
8. 当主句以here/there be开头时
A. Here is a car in the police station that was stolen last month.
B. There is a story that will surely interest you.
9. 当定语从句中包含一个定语从句时，如一个用了关系代词which，另一个多用that
A. He works in the factory which produces color TV sets that sell well in Southeast Asia.
B. Edison built up a factory which produced things that had never been seen before.
(二)、 下列情况下，一般用which而不用that
1. 非限制性定语从句中（指人用who指物用which）
A. The bus, which was full, was surrounded by an angry crowd.
B. Bamboo is hollow, which makes it very light.
C. He tried to make some excuses, which made his teacher very angry.
2. 在介词之后，人用whom物用which
A. This is the room in which we planned our future life.
B. Soon we got to a hill at the top of which there was a temple.
(三)、 指人时用who不用that
1. 当先行词是泛指代词he, they或指示代词时，(those指人用who,指物用which)
A. He who does no work gets no pay.
B. We are badly in need of those who can work in real earnest (有决心和精力).
2. 不定代词one, ones, anyone等作先行词时
A. One who works without complaint is welcome here.
参考资料：http://www.cntuw.com/topic_152739__41.html