Answer:
c) Increase account receivable
Step-by-step explanation:
When a company is billing customers for services on account their accounts receivable will increase because the company is selling the services to its customers on account which means they will receive money later so their accounts receivable will increase.
A is incorrect because service revenue will increase when they bill customers for services.
B is incorrect because cash will remain the same when they bill the customers.
D is incorrect because unearned revenue will remained unchanged.