What does the word ubiquitous mean in this sentence? No matter where we walked, we could hardly see because the smoke from the fire was ubiquitous. A) dark B) everywhere C) thick D) white

It would be Option B, everywhere.

With the sentence that goes along with the word, it fits nicely, suggesting that the smoke is everywhere. Since the smoke was everywhere they couldn't see.

The dictionary definition for ubiquitous is:

ubiquitous

{yoo-bik-wi-tuh s]    adjective

existing or being everywhere, especially at the same time; omnipresent:

what are you asking? this is gibberish.

could you provide an image?