Students who never miss class and study hard generally earn higher grades than those who do not. this is an example of:

The correct answer is known as "Incentives.

Incentives are described as something, which motivates an individual or group of individuals to do a task or to achieve something. For example is the statement given above, those students who attend class daily and studies hard, earns higher grades than those; high grades represent as the incentives wherein the students who study hard, receives them.