An ad using the positioning strategy

a. is a simple description of a key characteristic of the product.
b. is descriptive but it also makes a claim for superiority.
c. identifies something that the product has that all the competitors lack.
d. focuses attention more on the consumer's mind than the product itself.

The answer is c. identifies something that the product has that all the competitors lack.

Explanation:

"Positioning strategies" mean tactics and methods a company uses to "place" the product uniquely and in an unforgettable manner in the mind of the consumer/customer.

If an advertisement uses a positioning strategy, they focus on a particular aspect of its products or services.

The ad position itself is the central theme or message and acts as the "image" of the product!

By identifying an aspect that our product has and competitors lack, we carve out and high light a unique aspect of our product.

they work in some type of way