Which of the following must use the accrual method of accounting?

I.	A property management company, operating as a C corporation, with average annual gross receipts of $50 million.
II.	An incorporated law firm with average annual gross receipts of $6 million.
III.	An unincorporated grocery store with average annual gross receipts of $1,200,000.

a.All of these choices must use the accrual method.

b.None of these choices must use the accrual method.

c.Only I and III must use the accrual method.

d.Only I and II must use the accrual method.

e.Only III must use the accrual method.