The answer is D.
This is because:
A. -- You don't want to say nothing until the speaker is finished. This is because at some point you may forget what you were going to say, or it may not be as important to you after waiting so long.
B. -- You never want to speak in a loud voice to sound forceful. People will less likely agree with you or try to help you if you sound impatient and forceful.
C. -- Interrupting, for one, is already a rude thing. But interrupting after the speaker's every sentence is outrageous and not needed.
D. -- There may be more than one thing you need to be rephrased. If you quietly raise your hand in the middle when the speaker is taking a breath, it would be more likely that the speaker would gladly rephrase a particular point you are confused on. This also shows that you are fully engaged in the performance and are paying attention and taking mental notes.
