Hey there!
Your answer is D. Here's how it would look with these responses:
An informational interview is a good chance to network because they are designed to let the interviewer ask a working professional questions about their job.
However, it depends on how you look at it, his or her for option A could also work, however their just seems more concise and the better answer.
This seems grammatically correct, as opposed to "it is designed", and the other responses.
Hope this helps!
C) When he couldn't think of an answer
I believe blew would be the verb.
