Which type of vocabulary question would likely require knowledge of prefixes and suffixes?

The correct choice highlights the importance of understanding how words are constructed through prefixes and suffixes, which are elements added to a root word to modify its meaning. In vocabulary questions that focus on word derivation or meaning, a comprehensive knowledge of these affixes allows one to deduce meanings of unfamiliar words by breaking them down into their components. For instance, knowing that the prefix "un-" means "not" can help one understand that "unhappy" means "not happy." This skill is particularly useful in identifying the meanings of complex words and providing a deeper understanding of language.

The other options may touch on word meanings, but they do not specifically emphasize the structural elements like prefixes and suffixes necessary to derive meanings. Therefore, questions about synonyms or antonyms require different skills related to understanding word relationships, while questions focused solely on root words may not encompass the full range of meaning modifications that can occur with prefixes and suffixes.