请问各位如何区分A C，答案是C

with二

79－254－52 Therising of costs of data-processing operations atmany financial institutions has created a growing opportunity for independentcompanies to provide these services more efficiently and at lower cost.

(A)   The rising of costs

(B)   Rising costs

(C)   The rising cost

(D)   Because the rising cost

(E)   Because of rising costs

sayysong

A的主语是rising，而C的主语是the rising cost整个

sayysong

而且A中the rising of costs of data-processing operations中会有歧义，of data-processing operations作为介宾短语也能修饰the rising，而根据句子意思应该是修饰rising costs整体的。
个人理解，欢迎指正