A company extends its trade credit terms by four days to all its credit customers. The most likely effect of this change to the company’s credit customers is a four day:

A. increase in their operating cycle.

B. decrease in their operating cycle.

C. decrease in their net operating cycle.

答案是C

题目有点没看懂，为什么是a four day increase in payables而不是in receivables?

求解答，谢谢大家！