If Pushed by a Promising Investor to Indicate What Other

If pushed by a promising investor to indicate what other firms/angels you are talking to, you should:

A) Respectfully decline
B) Reveal only the strongest other prospects
C) Reveal only prospects that have co-invested with the prospective investor
D) Be up front and tell them what they want to know
E) Either respectfully decline or be up front and tell them what they want to know, depending upon the situation