Final answer:
The correct homonym is 'deer'.
Step-by-step explanation:
The correct homonym for the given sentence is B deer. In this sentence, 'a' is used to refer to one deer. To remember this homonym, you can think of the word 'deer' as the animal that has antlers. The homophone 'dear' is used to express affection or to refer to a beloved person or thing. The homophones 'pair' and 'pear' are unrelated and have different meanings and pronunciations.
Learn more about Homonyms