消费者购买4个同一商品,他愿意为第一个单位商品支付100元,为第二个商品支付80元,为第三个支付60元,为第四个支付40元,但他总共只须支付160元,则消费者剩余为()
A.100元
B.120元
C.140元
D.160元
正确答案是B
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