Answer: A) To give listeners a moment to think
Explanation: Rising intonation is often used in a speech to signal to the listener that additional information is coming, or to indicate that a point is not yet finished.
This can give the listener a moment to process the information and think about what has been said so far. Rising intonation can also be used to indicate a question or uncertainty, or to emphasize a point that is particularly important.
However, in the context of this question, the most likely reason to use rising intonation is to give listeners a moment to think.