Answer: A) There.
Explanation: homophones are two or more words having the same pronunciation but different meanings, origins, or spelling. The words "there," "their," and "they're" are homophones, "there" is a word that indicates place or position; "their" indicates possession; and "they're" is the contraction of "they are." From the given options, the one that correctly completes the sentence is "there": The computer on the corner desk is there for everyone to use.