Answer: D. economic incentives
Explanation:
Economic incentive refers to the kind of motivation strategy in which the person is provided with financial assistance and fulfill other kind of preferences according to needs, desire and wants of the person in return receiving the required task to be done or for achieving a social goal.
The given situation is an example of economic incentive this is because of the fact that mothers are provided with the paid family leave from work this is helpful in increasing the birth rate of woman. This is in effort for preventing a declining population.