(1) It Has Come to My Attention That the Staff

Multiple Choice

(1) It has come to my attention that the staff has turned my free-meal policy into a considerable expense to the restaurant.(2) For example, though our lobster purchases have risen dramatically, our sales of lobster dinners have remained flat.(3) We are going to have to charge employees a percentage of the price of the meals they eat at work.(4) After all, who wouldn't give themselves the best of everything for free?
" How does sentence (4) function in this passage?

A) it is a conclusion in the form of a question
B) it is a premise that works jointly with (1) and (2)
C) it is really a premise that independently provides some support for (3)
D) it is a rhetorical question with no logical force in the passage