题目内容：

Not all ads are used to promote a product or to increase a company’s profits. Which is the following statement correct?

A. All the ads are used to promote a product or to increase a company’s profits.

B. Neither of ads are used to promote a product or to increase a company’s profits.

C. Some of ads are used to promote a product or to increase a company’s profits.

D. None of ads are used to promote a product or to increase a company’s profits.