Which of the following statements regarding deadweight loss is least accurate（）

A. Deadweight loss occurs when the allocation of resources is inefficient.

B. Deadweight loss from underproduction leads to a loss of producer surplus but not consumer surplus.

C. Deadweight loss occurs when the quantity supplied does not maximize the sum of consumer and producer surplus.

单一品种产品生产的企业，不影响保本点的因素是（）。

A.固定成本总额

B.单位售价

C.单位变动成本

D.品种结构