Bro you need to learn to answer questions on your own so you learn, and that question is incredibly easy

Answer:

"emits" is in the present tense. (C)

Explanation:

Take a look at the sentence. It's a common declarative sentence. It's stating a fact that it happens whenever it happens. So it's basically "this is a fact and it can happen anytime and it just does". Look. Smoke coming from vehicles emits unsafe chemicals.

If it were past tense it'll be like "Smoke that came from those vehicles emitted unsafe chemicals".

Also take note that present tense has forms. Simple, progressive, and perfect.

Simple - emit / emits (it happens)

Progressive - emitting (it's happening right now progressively)

Perfect - has emitted (hard to explain)

So that means, "emits" in the sentence means it just happens, and when that means that it's the "most simple" form of 'happening', it's present tense. To quickly recognize a present tense verb, it can— not end with '-s' (when there is a plural noun before it, which is the simplest form), it ends with '-s' or '-es', and it ends with '-ing'. The last letter of the verb might be also repeated in some words (example emitting).

Hope that helps, feel free to correct me in anything!

Answer:

B. Past

I hope tama

Godbles