Choice "B" is correct. A statement of cash flows must be presented for all proprietary funds as part of a set of financial statements. This requirement would apply to both public benefit corporations and governmental utilities.Choice "c" is incorrect. All governmental entities that use proprietary fund accounting must present a statement of cash flows.Choice "a" is incorrect. Public benefit corporations that use proprietary fund accounting should present a statement of cash flows.Choice "d" is incorrect. Governmental utilities that use proprietary fund accounting should present a statement of cash flows.