An opportunity cost is a. the benefit gained by choosing a certain course of action b. costs that have been incurred in the past c. the cost incurred to gain the opportunity to make a sale d. the benefit given up by choosing an alternative course of action

Option (D)

Explanation:

Opportunity costs are known to present the benefits that an individual misses while they opt for an alternative over the another one. When an individual chooses an option from the alternatives, then the opportunity cost is referred to as the cost that has incurred by not appreciating the benefit which are confederated with the known alternative choice.

the first successful, urban blues recording, selling more than 75,000 copies, was made in year 1920.

mamie smith recorded the first commercially successful example of the urban blues,   with the recording of “crazy blues”."crazy blues" was recorded on august 10, 1920, in new york city. within a month of the release of “crazy blues” it had sold 75,000 copies.

answer; false pretense;