参考答案

正确答案：C
解析：“vis—a`-vis”这个词组有“面对面地；与……面对面；对面地；跟……比较；关于”的意思。但是，根据该句的上下文意思“Current，former and potential customers were asked to describe their ideal e— commerce company vis—a`-vis a subset of the top e-commerce companies”，这个词组的意思应该是“相比较；与……比较”。