Concept: The correct word must describe having plenty of time in prison.Explanation:The sentence is: “While he was in prison he had ______ time to read a lot of books.” The word “ample” means enough or more than enough, or plentiful. In prison, one clearly has abundant time for reading. “Real time” does not fit the context, “few time” is grammatically incorrect, and “most time” is not the best choice. Thus, “ample” best completes the sentence.Answer: A. ample