In the given sentence about reading the book, the word read is an example of a heteronym. Thus, option b is correct.
<h3>What are heteronyms?</h3>
Heteronyms are the words that have the same spellings but the sounds while reading them are different. Here in the sentence, the word read is a heteronym that has the same spelling but is pronounced differently.
On the other hand, homonyms are words that same spelling and pronunciation but differ in meaning. Idioms are words that are used as figurative language and express a different meaning.
Therefore, option b. a heteronym is a correct option.
Learn more about heteronyms here:
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