Umm…. What is that question?
Answer:
Verb agreement.
Explanation:
Punctuation marks are used for the following: to create pauses, flow, or rhythm within a sentence or a text. The way to do this is to use commas or periods to create pauses, commas or conjunctions to create flow, commas or colons to create rhythm, etc. However, one thing that punctuation cannot do is affect verb agreement. Verb agreement means that the subject and the predicate (verb) are in the same number: if the subject is singular, the verb will also be singular; if the subject is plural, so is the verb. This depends on the subject, not on punctuation.
The correct option is D.
Marginal cost refers to the amount of money it cost a company to produce one more of a particular product while the marginal benefit refers to the benefit that is obtained as a result of producing that one extra product. Profit is maximized when the marginal cost equals the marginal benefits.