The answer is B, because if it says that "Martin luther king voice had a strong power over the audience" that obviously means he was speaking and a very dominant tone which means all eyes and ears where peered upon him.
The root word of the word "dispel" is pel- (5) which means "to thrust, strike, drive").
This root word is the base word where new words were formed, still bearing the original meanings in part.
<h3>What is a Root Word?</h3>
This refers to the base word that shows the etymology (or origin) of a word that is used to form new words.
Hence, we can see that the root word of the word "dispel" is pel- (5) which means "to thrust, strike, drive").
Some words that can be formed based on the root word are:
Read more about root words here:
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A. I used to be afraid of the ocean; even so now I am a champion surfer.