You Ask a Child Preparing His Portfolio, "Tell Me Why

You ask a child preparing his portfolio, "Tell me why you selected that piece." He answers, "I picked it because it was good." Your response to this is:

A) To teach the child additional self-reflection skills.
B) To accept the child's response without further comment.
C) To tell the child that his answer is not well thought out and ask for another response.
D) To encourage the child to also tell what is wrong with the piece.