Which phrase best captures the theme of perseverance through exhaustion?

Which phrase best captures the theme of perseverance through exhaustion?

• A. The endurance of physical fatigue alone solves the speaker's condition.
• B. The endurance of mental fatigue proves the power of doubt.
• C. The endurance of emotion through sleep is the key.
• D. Love can keep a person emotionally and mentally awake, even when they are physically tired.

Answer: (D)