Fill in the blank with the most appropriate word. A: Do they allow smoking? B: No, smoking _________ inside the terminal building.

The correct answer is D. is not allowed.

The other options are incorrect because:

• A. doesn’t allow is in the present tense, but the question is about the present prohibition of smoking.
• B. wasn’t allow is in the past tense, but the question is about the present prohibition of smoking.
• C. hasn’t been allowed is the present perfect tense, which can be used to talk about a prohibition that has been in place for some time. However, in this case, the question is about the present prohibition of smoking, so the present tense is more appropriate.

The sentence “No, smoking is not allowed inside the terminal building” is a clear and concise way to express the prohibition of smoking.