Which Is the Best Description of Competitive Product Analysis

Which is the best description of competitive product analysis?

A) A company looks at all the competitors' products and rates them on a scale of 1 to 10.
B) An independent testing service,such as Consumers' Union,is hired to test and rate a group of competing products.
C) A competitor's product is purchased,disassembled,and the components tested in order to generate ideas for improving the quality of products.
D) An independent firm conducts consumer research in order to rate competing products.
E) It is the result of a consumer survey by the marketing department.