Which of the following are the types of rules that communication follows?
a. nonverbal rules
b. verbal rules
language rules
d. vocabulary rules

The correct answer is the language rules.

Explanation:

Within communication, there must be language rules for the speakers. A native speaker implicitly has to know the vocabulary, grammar, and the syntax of the words he or she is speaking with other people.  And there must be a knowledge of colloquialism, jargons, idioms and other conventions to maintain a good communication.

a. it reminds protestors of the reasons they have to protest.