Even though the producer surplus increases under a monopoly scenario, relative to one of perfect competition, the consumer surplus :（）

A. decreases by a lesser amount.

B. decreases by a greater amount.

C. decreases by an equal amount.

甲男与乙女于某日中午公开在某公园内发生性关系，引起游客的极大愤慨，造成恶劣的社会影响。对甲、乙的行为应如何认定

A．聚众淫乱罪

B．组织淫秽表演罪

C．寻衅滋事罪

D．无罪