Which of the following sentences correctly uses the word 'its'?

The selected sentence effectively uses the word 'its,' which is a possessive adjective indicating that something belongs to or is associated with the subject, in this case, the company. 'Its customers' clearly communicates that the customers are associated with the company, embodying the correct form of possession.

In contrast, the other sentences either use the wrong form of 'its' or employ incorrect contractions. For example, 'it's' is a contraction meaning 'it is' or 'it has,' and is incorrectly used in the first and fourth options. The third sentence improperly uses 'they're,' which is also a contraction meaning 'they are,' instead of the correct possessive form 'their.' Therefore, the choice that utilizes 'its' correctly to denote possession is indeed the one that stands out as correct.