I have read . . . . . . . . Iliad several times over. A. a B. an C. the D. no article

The correct answer is D. no article.

The Iliad is a single, unified work, so it is not preceded by an article.

A and B are incorrect because they are indefinite articles. Indefinite articles are used to refer to a general or unspecified thing or person. In this case, the speaker is referring to a specific work, so an indefinite article would not be appropriate.

C is incorrect because it is a definite article. Definite articles are used to refer to a specific or particular thing or person. In this case, the speaker is referring to a general work, so a definite article would not be appropriate.