While Giving a Speech, Beatrice Used Pauses Strategically, Spoke Loud

Multiple Choice

While giving a speech, Beatrice used pauses strategically, spoke loud enough for everyone to hear, and used a perfect tone.However, she spoke too fast for her audience to be able to understand a few of her more complex ideas..In this scenario, Beatrice should moderate her _____ of speech to improve intelligibility.

A) rate 
B) pitch 
C) volume 
D) tone