Final Answer:
The passage delves into the inner musings of Montag as he reflects on the numbness in his face and body, triggered by a particular incident. The use of "he thought" signifies Montag's personal contemplations, making option a. Montag's thoughts the most fitting description. So, the correct answer is a. Montag's thoughts.
Step-by-step explanation:
Inner Reflections: The passage captures Montag's introspective moment, exploring the onset of numbness and the reflection on when it truly began.
Ownership Clarity: The phrase "he thought" explicitly attributes these contemplations to Montag, emphasizing that these are his personal thoughts and reflections.
Relevance to Narrative: Montag's thoughts often play a crucial role in understanding his character and the evolving narrative in the context of the book, "Fahrenheit 451."
Therefore, the correct answer is a. Montag's thoughts.