Both C and D are the same so either could be correct, but it is not a or b that’s for sure
Answer: C
Explanation: the sentence makes sense without the whom
C. to give information, is the purpose for the author in writing this passage.
B, the whole point of a test, exam or assessment is to see how much you know; it is never about judgement. Just because someone doesn't pass a test, it doesn't mean they are dumb.
