Which of the Following Is True?​

Multiple Choice

Which of the following is true?​

A) ​If the consumer is a buyer of several units of a good, the earlier units will have greater marginal value and therefore create more consumer surplus, because marginal willingness to pay falls as greater quantities are consumed in any period.
B) ​When some units of output can be produced at a cost that is lower than the market price, the seller receives a surplus, or net benefit, from producing those units.
C) ​At the market equilibrium both consumers and producers benefit from trading every unit up to the market equilibrium output.
D) ​All of the above are true.