Rana Has Just Heard Vanessa's Suggestion for Resolving a Research

Rana has just heard Vanessa's suggestion for resolving a research issue that the team has encountered. Vanessa's idea isn't fully thought out and needs more explanation. Which of Rana's responses would be most valuable to the team?

A) Rana should discourage Vanessa from contributing to meetings until she has learned the skills to do so properly.
B) Rana should prompt Vanessa to continue with a non-judgmental question like "I'm not sure I understand this idea completely. Can you elaborate?"
C) Rana should save the group time by pointing out how Vanessa could present her ideas the next time with a sentence like "Please think about this more before you present it, Vanessa."
D) Rana should not say anything so that Vanessa can save face and won't feel embarrassed to speak up next time.
E) Rana should finish Vanessa's thought for her.