Answer:
Option (a) Commission
Explanation:
Commission is a payment that is received by an agent which is some part of the fees.
The fees is charged by the service provider for providing its services.
Some employers provide commission so that the agents or the employees work more efficiently, as more the employees provide the employer with the customers more will be the fees paid to the employer by the customer and, hence some part of that fees will be given to the employee as commission.