A Copywriter Is Deciding on the Best Approach for a Magazine

A copywriter is deciding on the best approach for a magazine ad featuring a protein energy bar, and has narrowed down her options to two types-testimonial or dialogue.Which of the following is a major difference between a testimonial and a dialogue?

A) A testimonial approach is written by the spokesperson, while a dialogue approach is written by the copywriter.
B) A testimonial approach is one-sided, while a dialogue approach has two people conversing.
C) A testimonial approach uses the hard-sell method to push the product, while a dialogue approach uses the image method to create a social setting.
D) A testimonial approach emphasizes product benefits, while a dialogue approach emphasizes image.