The biological clock remains accurate in spite of large changes in environmental temperature.

A) If the clock were as sensitive as most other chemical reactions are to temperature changes, it would function as a thermometer rather than a clock.
B) If the clock were sensitive to temperature, the biological clocks of some animals would run at different rates at different times of day.
C) This is surprising if one assumes that the timing mechanism is rooted in the cells' biochemistry.
D) All of the above.