Answer:
D. 
Step-by-step explanation:
Testimonials is a persuasive technique is advertising industry. In this technique in which a celebrity or an expert usually endorse an advertisement. 
In the given case, the persuasive technique used is a testimonial technique. The Hollywood diva Lila Santiago is endorsing her Stylin' Shades. Her testimony will attract buyers to buy Stylin' Shades product to look a diva like her. 
Therefore, option D is correct.