The best reason a formal tone and language should be used in a professional electronic communication is because informal communications are more easily misinterpreted. The correct answer is A.
While Colonel Pickering is not what all would consider to being a "true gentleman", he is the closest to it. He has more respect toward Eliza than Higgins, whose only concern is for himself. Doolittle is only a selfish, terrrible father, and Freddy is not in love with Eliza, but merely wants to use her. Thus Colonel Pickering is the closest character to being a "true gentleman".
A prepositional phrase is a group of words that lacks either a verb or a subject, and that functions as a unified part of speech. It normally consists of a preposition and a noun or a preposition and a pronoun.
