Which sentence uses a verb that agrees with its subject? a. where was they sitting during the fireworks show? b. has the nelsons returned home? c. is those shirts clean? d. at the top of the stairwell lies our old cat.

Option D is the correct answer.

The correct use of verbs for sentences A, B, and C are below:
Where were they sitting during the fireworks show?
Have the Nelsons returned home?
Are those shirts clean?

Hope this helps.

In my opinion i think option D. is the best.
Why?
because listen to this:
Is those shirt's clean?(this is 100% wrong)
Where was the sitting during the firework's show?(also wrong)
HAS the nelson's returned home?(totaly wrong)
so the olny option left is D.At the top of the stairwell lies our old cat.

(can you vote brainliest please?)

According to my researches, the statement   "the factual information allows you to judge how credible the analysis in the source is." is not true. a factual information does not judge any credible analysis because it shows facts that are generally known by everyone.