单选题：某公司为扩大销售额定制了四种方案。四种方案所需的费用与可能得到的销售额预计数如下表所示。采用单一目标决策法选择，四种方案

题目内容：
某公司为扩大销售额定制了四种方案。四种方案所需的费用与可能得到的销售额预计数如下表所示。采用单一目标决策法选择，四种方案中最优的方案是（　　）。

方案 		费用（万元） 销售额预计数（万元）
甲 6 90
乙 9 162
丙 10 220
丁 12 240
A．甲
B．乙
C．丙
D．丁

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