What type of context clue offers information about the function, features, or appearance of an unfamiliar word?

The correct answer is B. Explanation.

Explanation context clues provide additional information about how a word functions, its features, or its appearance, which can help you infer its meaning. For example, if a sentence describes the purpose or uses of an unfamiliar word, it serves as an explanation clue. If you have more questions or need further assistance, feel free to ask!