A recent study, published by the California Bureau of Employment, foun

A recent study, published by the California Bureau of Employment, found that people who sent in resumes with “ethnic-sounding” names had a much more difficult time getting called back from employers as people who sent in resumes showing similar qualifications but “white-sounding” names.

a)employers as people who sent in resumes showing similar qualifications but “white-sounding” names.

b)employers as those who did send in resumes showing similar qualifications but with “white-sounding” names.

c)employers than those who sent in resumes showing similar qualifications but “white-sounding” names.

d)employers than those who did send in resumes showing similar qualifications but with “white-sounding” names.

e)employers than people did who sent in resumes showing similar qualifications but with “white-sounding” names.

First thing to notice is that this is a comparison question. 50% of the answer is solved when you recognize the question type. Rest is up to the application of your skills.
From comparison we know that x more than y is the correct form.
A) This choice uses :more more .....as -> Incorrect
B) Same as A.

Now in C,D and E -> much more....than..is correct. However, the second thing to notice is that the parallelism marker represents similar logic,meaning in X more than Y. X and Y should have the same structure.
Notice the non underline part of the sentence :
people who sent in resumes with “ethnic-sounding” names . So the correct answer should have similar structure. So at this point C is out.

Between D and E, E wins because 'those' is ambigous, what does it refer to people or employers. In E the pronoun those is clearly replaced by people. Hence E is the correct answer.

I have generally observed that whenever a pronoun is replaced by a noun in an option than that option is generally correct over the one with pronoun. Usually the option with pronoun has ambiguity and the other option is resolving that ambiguity.

Hope it helps !