The best example of an adverb phrase is B. Mr. Bruns had been teaching for 35 years.
This is an adverb phrase, because the phrase "for 35 years" answers the question of how long Mr. Bruns had been teaching. The verb is "teaching", and "for 35 years" modifies this verb.
Second statement has logos in it
I think the answer is A) : because is a form of punctuation to use before you list things.