| Oh, I just redid that problem today.
The reason why it is A is because:
B is not specific because the "there", the reference is unknown.
C, we don't know where the "where" refers to
Same with E.
Obviously not D because D is not an independent clause (or complete sentence).
Therefore, A is the best answer because we know where he practices law and it is a dependent clause.
-------
+edit
I know, its a weird problem. In real life talking, we would assume that the person knows where to practice law. but in the sat = no.
Pronouns and their references seem to be popular in improving sentences. | 
College Confidential is dedicated to providing the best free college admissions information available on the Web, through our many articles and this discussion forum.
