The choices can be found elsewhere and as follows:
a.) The revenue is always more than the cost.
b.) Ideally, the cost will be less than the revenue.
c.) The profit function can be represented by P(x)= R(x)-C(x).
I think the correct answer is option A. The revenue is always more than the cost is not a true statement. It does not necessarily always have to be in such way. Hope this answers the question.