This question asks you to identify the author's tone, which refers to the author's attitude, voice, and emotional color toward the subject matter.
Why the correct choice is correct: The author uses complex, contemplative vocabulary ("immutable dichotomies," "existential polarity," "chiaroscuro of consciousness") and deeply reflects on the nature of human existence, suffering, and joy. The author explicitly draws upon formal thought systems (Stoicism and Buddhism) to analyze how emotional contrast builds meaning. This intellectual, reflective, and deep examination of life is classic philosophical writing.