Marketing involves which of the following?

A) Providing information to potential competitors.

B) Wage negotiations with one's labor force.

C) Redesigning a product to make it more desirable.

D) Growing corn and raising pigs

E) All of the above

C.

Explanation:

First of all, C is the only that make sense.

Marketing refers to a set of processes that allow you to create, design, develop (innovate), communicate and deliver product or service offers which have some value to costumers or companies.

So, 'redesigning a product to make it more desirable' completely fits with marketing's definition and applies to its work field.