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.

下面是我国某一“五年计划”时期工农业生产的发展状况柱状图（单位：万吨）。在该“五年计划”时期

A．社会主义改造的任务基本完成

B．“ * * ”使经济建设遭受严重挫折

C．“左”倾错误对经济发展造成严重影响

D．中国特色社会主义建设已取得初步成效