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【单选题】
某商店购进一种商品，单价为30元．试销中发现这种商品每天的销售量P（件）与每件的销售价x（元）满足关系：P=100-2x．若商店在试销期间每天销售这种商品获得200元的利润，根据题意，下面所列方程正确的是（ ）A.
（x-30）（100-2x）=200
B.
x（100-2x）=200
C.
（30-x）（100-2x）=200
D.
（x-30）（2x-100）=200
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