Using powerful words is a key principle of ________ communication.

A) wimpy
B) persuasive
C) controlling
D) helpful

Powerful words have the ability to persuade and influence others, which is a key principle of persuasive communication. Using weak or "wimpy" words may not have the same effect. Controlling language may be effective in certain situations, but it can also be negative and manipulative. Helpful communication involves clear and concise language, but may not necessarily be persuasive.