Question

So don't be left out. When you put on a pair of Stylin'

Shades, you enter an ever-growing world of fun-loving
fashionistas. Buy a pair and join the fashion parade today.
statistics
bandwagon appeal
expert opinion
testimonial

Answer 1

Bandwagon appeal.

Not a statistic, expert opinion, or testimonial. It's trying to get you to bandwagon and fit in.