52. The rising of costs of data-processing operations at many financial institutions has created a growing opportunity for independent companies 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
1. 句子完整性（一级排除D, E）
出现连词引导的分句一定要有对应的主句。 Choices D and E produce sentence fragments since Because makes the clause subordinate rather than independent.
The rising cost / The rising of costs has created a growing opportunity for independent companies to provide these services more efficiently and at lower cost. Has created 表示前面那个动作已经完成了, 完成的完整的过程, 不能用动名词the rising of costsè gerund is only the name of an action. 要么用the rising cost, 核心词在cost上面, 和a growing opportunity并列, 要么用the rise in costè 但是就不平行了