. . . . . . . . cell phones do not cause cancer. A. a B. an C. the D. no article

The correct answer is D. no article.

The word “cell phone” is a common noun, which means that it refers to a general class of objects. Common nouns are not preceded by articles unless they are modified by a specific adjective or phrase. In this case, the sentence “cell phones do not cause cancer” is a general statement about all cell phones, so it does not require an article.

The other options are incorrect because they are all articles. A and an are indefinite articles, which are used to refer to a general class of objects or to a