Correct Answer: B
Explanation:
The clue is in the word �belies� which means �contradicts�. Hence, the diary contains matter that suggests the opposite of what is true in the academic part of Mannering�s life. Sine he is known for deep thought, the diary must contain matter that is the opposite of �deep�. �Mundane� and �petty� are the correct answers because �mundane� suggests something boring or ordinary and �petty� suggests something minor or trivial. Note that this is one case where the correct answers are not exactly synonymous. [Erudite = learned, knowledgeable; untoward = unexpected]