Which of the Following Is the BEST Advice for Handling

Which of the following is the BEST advice for handling questions after a presentation?

A) Nod your head to indicate that you understand each question as it is asked.
B) If someone asks a question about something you already explained, gently remind him or her that you've already covered that information, and go on to the next question.
C) Link your answers to points you made during your presentation.
D) Say, "That's a good question" when someone says something particularly apt, to encourage people to think carefully about their questions.