What is an example of an adverb phrase/clause

An adverb clause, on the other hand, is a group of words that does contain a subject and a verb. That group of words modifies a verb, adverb or adjective in the sentence, just as an adverb phrase does. For example: I parked the car where I could easily find it later.Explanation:

the message which is being conveyed is that if a person does not have the qualified skills to be an writer then he should not and if he becomes then just leave it away..

i think this is it plz check

"a" because he is appealing to logic as oppose to appealing to the audience's emotions.