The answer is "D. Testimonials".
In promotion and of publicizing, a testimonial or show comprises of a man's composed or talked explanation lauding the goodness of an item. The term "testimonial" most regularly applies to the attempts to close the deal credited to common nationals, while "endorsement" more often than not holds a candle to the current situation to pitches by famous people. Testimonials can be a piece of mutual advertising. Once in a while, the animation character can be a testimonial in a business.