Is Considering Marginal Utility a Natural Process Experienced by Humans

Multiple Choice

Is considering marginal utility a natural process experienced by humans?

A) No.Only economists engage in this sort of "bean counting" involving utils.
B) No.Humans don't all think the same way,so it follows that decision making is also relative.
C) Maybe.Good consumers consider marginal utility,while poor consumers don't.
D) Yes.Conscious calculations involving utils are a part of every decision.
E) Yes.Humans have an instinct,as self-interested,rational beings,to seek the most satisfaction.