He can’t live on . . . . . . . . 100 dollars a month. A. a B. an C. the D. no article

The correct answer is D. no article.

The word “dollar” is a count noun, which means it can be used with a number and an article (a or an) to refer to a specific dollar. For example, “I have a dollar” or “I found an old dollar on the ground.” However, when it is used to refer to money in general, it is not used with an article. For example, “He can’t live on $100 a