B. She was an honorable person, which became clear when she refused to look at the answer key for the test.
Explanation:
In the sentence there is three important information:
i: she was an honorable person,
ii: it could be seen
iii: because she refused to look the answers to the questions of the test.
This is the best answer because it still maintains the same meaning as "the answers to the questions that were coming for the test" is the same as "the answer key for the test" and contains the three important information of the sentence.
