Answer:
b. Costs that are small and unimportant with little impact on profits are called marginal costs..
This statement is wrong because the importance or size of the cost has nothing to do with it being marginal. Marginal costs are the extra cost of producing one extra unit. For eg if a company is making 100 units of a good, the cost to make the 101st unit will be the marginal cost of that good.
Explanation: