"Stealth Marketing" Occurs When

"Stealth marketing" occurs when

A) a company places subliminal advertising in a web site.
B) people provide objective reviews of a product on a social media site with a negative tone.
C) people provide positive reviews of a product without divulging that they were given the product for free for a flattering portrayal.
D) people provide negative objective negative reviews of a product on a social media site.
E) a company uses powerfully persuasive language to convince customers to buy a product.