The correct answer is option D, change in temperature
Reason -
The climatic change affects all our metabolic processes. During winter when the temperature is low, the daily rate of dehydration becomes extremely low in our body and thus, the rate of sweating also reduces due to which the requirement of water in our body gets minimal.
While in summer, when the external temperature is at its peak condition, the rate of dehydration becomes extremely high and thus the rate of sweating increases which in turn enhances the requirement of water in our body as we get thirsty very fast.