Answer:
Option (d).
Explanation:
Enzymes are bio catalyst that can increase the rate of a bio chemical reactions of the body. Enzymes work at specific pH and temperature conditions only.
The activity of enzyme is highest at its optimum temperatures. The treatment of enzyme with excess heat or cold can decrease the enzyme activity. The exposure to cold decreases the activity of a enzyme as motion of the molecules decreases at low temperatures.
Thus, the correct answer is option (d)
