A Nigerian student decides to attend a university lecture instead of working at a part-time job that pays ₦3,000 per hour. If the lecture lasts two hours, the opportunity cost of attending the lecture is

Opportunity cost is the value of the next best alternative forgone when a choice is made. The student gives up two hours of part-time work at ₦3,000 per hour, so the opportunity cost is ₦3,000 × 2 = ₦6,000. Option A incorrectly uses only one hour, while C and D misrepresent the concept.