单选题:运输供给价格弹性系数是采用(  )之比来计算的。

题目内容:
运输供给价格弹性系数是采用(  )之比来计算的。 A.运输供给量与运输需求量
B.运输供给量增加量与运输价格增长值
C.运输供给量与运输价格水平
D.运输供给变化率与运输价格变化率
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