Answer: Drive reduction theory.
Explanation:
Drive reduction theory is a kind of motivational theory. It can be defined as the major theory for the motivation in the order to achieve the goal.
It can be defined as the motivation that arises due to the physiological need or psychological need of the person.
It is the inner motive force in an individual that motivates a person to do work.
Here, she needs to finish the work of photography which she is not concentrating due to lack of water. She moves towards her car to get water and continue her work.