Fill in the blank with the most appropriate word. A: Shall we go out? B: No, it _________.

The correct answer is: A. is snowing

The sentence is in the present tense, so the verb should also be in the present tense. The other options are in the past tense, which is not grammatically correct in this context.

• A. is snowing is the present continuous tense of the verb “to snow”. It is used to describe an action that is happening at the moment of speaking.
• B. snows is the simple present tense of the verb “to snow”. It is used to describe an action that happens regularly or habitually.
• C. was snowing is the past simple tense of the verb “to snow”. It is used to describe an action that happened in the past.
• D. snowed is the past participle of the verb “to snow”. It is used to form the perfect tenses and the passive voice.

In this case, the speaker is saying that it is snowing outside, so the correct answer is “is snowing”.