There’s . . . . . . . . open-fire in the living room. A. a B. an C. the D. no article

The correct answer is: D. no article

An open-fire is a general concept, not a specific one. It is not a unique object, so it does not need an article.

• A and B are incorrect because they are indefinite articles. Indefinite articles are used to refer to general or unspecified nouns. In this case, the open-fire is not a general or unspecified noun, so it does not need an indefinite article.
• C is incorrect because it is a definite article. Definite articles are used to refer to specific or particular nouns. In this case, the open-fire is not a specific or particular noun, so it does not need a definite article.