The correct answer is B. An example
Step-by-step explanation:
In texts, a context clue refers to the information or clues the context of a word provides about its meaning; also this clues can be of different types as some texts include a synonym or an antonym to define a complex or unknown words, but others can include an example or restate the word using a sentence. In the case of the sentence presented, the unknown or unfamiliar word is "loquacious" and this is mainly described by " He once gave a twenty minute monologue about his favorite movie", this implies in this case the text provides an example or case in which Jake showed he was loquacious suggesting loquacious means to talk a lot which is actually the meaning of the word. Therefore, this passage provides a context clue based on an example.