If the Cost of Mining X Kg of Gold Is

Multiple Choice

If the cost of mining x kg of gold is C(x) = A + Bx + C dollars where A, B, and C are positive constants, which of the following statements is true for a given positive value of x?

A) The marginal cost C'(x) is greater than the cost C(x + 1) - C(x) of mining 1 more kg.
B) The marginal cost C'(x) is less than the cost C(x + 1) - C(x) of mining 1 more kg.
C) The marginal cost C'(x) is equal to the cost C(x + 1) - C(x) of mining 1 more kg.
D) There is not enough information to make any conclusion.
E) None of the above