Difference between siltent and quiet

[Strawberry girl]

Test No. incompl/inter-42 "Keeping it Quiet", question 6

The so-called ......... majority are the vast number of people who don't actually go out on the street and protest.

(a) quiet
(b) noiseless
(c) silent
(d) still

Test No. incompl/inter-42 "Keeping it Quiet", answer 6

The so-called silent majority are the vast number of people who don't actually go out on the street and protest.

Correct answer: (c) silent

Your answer was: incorrect
The so-called quiet majority are the vast number of people who don't actually go out on the street and protest.
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Hi,Alan
All of the answers have the same meaning.Why we should choose this one?What is the differences?

[Alan]

This expression uses the word silent because it refers to people not saying anything/not speaking about their feelings/objections.

Alan
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English as a Second Language
You can read my ESL story Present Simple