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【单选题】
某个二元连续精馏塔的设计任务描述：原料组成为0.5（轻组分摩尔分数，下同），塔顶产品组成为0.92，规定塔顶产品采出率为0.55。该任务制定得是否合理（ ）
A.
不合理
B.
合理
C.
缺少条件，无法判断
D.
需要根据塔釜的组成来确定
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