下图描述的是一定时期内某地猪肉的需求曲线由D1左移到D2。下

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下图描述的是一定时期内某地猪肉的需求曲线由D₁左移到D₂。下列事件中能导致这种变动关系的是

①养猪业社会劳动生产率普遍提高
②市场上其他肉类供应量大幅增加
③该地区居民的收入水平大幅提高
④媒体曝光40吨病死猪肉销往该地

A．②③

B．①④

C．①③

D．②④

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