For Any Individual Period the Firm Cash Flows Are a Circular

For any individual period the firm cash flows are a circular flow of funds, this means:

A) that cash flows are always invested in fixed assets.
B) that cash flows are always in a spiral away from the firm.
C) that firm cash flows must be borrowed externally to be reinvested in the economy.
D) that all cash flows generated by the firm must equal the cash flows paid to the creditors and shareholders.