Which Is the Best Statement for Gatekeeping in a Shy

Which is the best statement for gatekeeping in a shy member who has said nothing during a discussion and who looks to you as if he may want to say something?

A) "John, what do you think on this question?"
B) "John, you've said nothing about the question. It's time you say what you think."
C) "John, I'm sure glad to see you are finally ready to speak up on this question."
D) "John, would you like to say something about this question?"
E) none of these