what is the greatest advantage to using a wireless clip-on microphone?

A you can put your hands in your pockets so that you will not appear nervous
B you can have the ability to hold papers in your hands so that you can read dirctly from the text when giving your speech
C you cannot wishpser or shout for dramatic effect
D you can have both hands free in order to gesture during your speech

D you can have both hands free in order to gesture during your speech