Which of the following is an example of a homophone?

The choice of "write/right" as an example of a homophone is correct because homophones are words that sound the same but have different meanings and often different spellings. In this instance, "write" refers to the act of composing text, while "right" can denote correctness or direction. Despite their different meanings, they are pronounced identically, making them classic examples of homophones.

The other pairs do not fit the definition of homophones as clearly. "Read/red" consists of a homograph, as the first word can be pronounced in two different ways (present vs. past tense) depending on context. "Word/sound" contains two distinct words that do not sound alike, and "break/break" is not a homophone pair since it consists of the same word with the same meaning and pronunciation. Hence, "write/right" exemplifies the characteristics of homophones effectively.