Core body temperature is highest at:

Correct option is C

Core body temperature follows a circadian rhythm. It is lowest in the early morning (around 4–6 AM) and highest in the late afternoon (around 4–6 PM). This fluctuation is regulated by the hypothalamus and influenced by hormonal activity and metabolism. Explanation of options:
· (a) ✘ Temperature is at its lowest in early morning.
· (b) ✘ Noon reflects a moderate body temperature, not the peak.
· (c) ✔ Correct; late afternoon is the time when the core temperature peaks.
· (d) ✘ Evening may show a decline as body prepares for rest.