Which of the following is often used to enhance a word’s meaning?

The correct answer is a prefix. A prefix is a group of letters added to the beginning of a word to modify its meaning or create a new word. For example, consider the word "happy." By adding the prefix "un-" to it, you create "unhappy," which changes the meaning from a positive state to a negative one. Prefixes can provide crucial context and nuance, allowing for more precise expression.

In contrast, adjectives serve to describe nouns, but they do not modify the base meaning of the word itself. Conjunctions are used to connect words, phrases, or clauses, which does not enhance the meaning of individual words directly. Verbs indicate actions or states of being, but they do not serve to modify or enhance the meaning of words like prefixes do. Therefore, prefixes are specifically designed to enhance and alter a word's meaning, making them the best choice in this context.