Maurice receives $100 as a birthday gift. In deciding how to spend the money, he narrows his options down to four choices: Option A, Option B, Option C, and Option D. Each option costs $100. Finally he decides on Option B. The opportunity cost of this decision is
(a) the value to Maurice of the option he would have chosen had Option B not been available.
(b) the value to Maurice of Options A, C and D combined.
(c) $100.
(d) $300.