When giving a speech that requires a call to action, many speakers use rhetorical questions. What is a rhetorical question?

Aa question that is used to check for understanding
Ba question that is asked and answered by the speaker
Ca question asked solely to produce an effect rather than a reply
Da question that is asked by the audience after the speech is done

Verified Answer :

A rhetorical question is C. a question asked solely to produce an effect rather than a reply. 

In other words, a rhetorical question isn't supposed to be answered, it's just supposed to give the listener/reader a specific feeling.