Frederick douglass's use of the following phrase is an example of what figurative language?
"a still tongue makes a wise head."

a. idiom
b. hyperbole
c. metaphor
d. personification

"A still tongue makes a wise head"   is an idiom. Option A is correct.

This saying may mean that someone who does not talk much, but listens to other people, probably has experience, knowledge and good judgement.

An idiom is a type figure of speech which should not be taken literally. It is established by usage that has a meaning not necessarily deductible from those of the individual words.

Idioms convey a particular sentiment, but they do not literally mean what the individual words themselves mean.

the answer is actually c   i just got done with the test.

- "a nonrestrictive clause functions as a modifier to a noun (that is an object, person or concept). these clauses can be described by the following three options: it is set off by comas, it contains a subject and a verbs and it adds nonessential information to the sentence.

for example, in "here is bill gates, who confounded microsoft software company" we can identify "who confounded microsoft software company" as a nonrestrictive clause modifying the noun bill gates. this clause can be describes as a nonrestrictive clause because it is separated by a comma, it adds nonessential information to identify who bill gates is and it must contain both a subject (who) and a verb (confounded)."