Which of the following words exemplifies a homophone?

The word pair "to" and "too" exemplifies a homophone because they are pronounced the same way but have different meanings and spellings. "To" is a preposition that indicates direction or position, while "too" is an adverb meaning also or excessively. This demonstrates the concept of homophones, where two or more words sound alike but differ in meaning.

In comparison, "read" (present tense) and "read" (past tense) are homographs, as they share the same spelling but have different meanings and pronunciations. "Bat" (the animal) and "bat" (the sporting equipment) also fall into the category of homographs for similar reasons, while "bow" (to bend forward) and "bow" (the front of a ship or a weapon used to shoot arrows) are homographs too. However, these examples do not fit the definition of homophones since they do not sound alike in different contexts, unlike "to" and "too."