21. A noncancelable lease contains an option to purchase a leased asset at a price that is sufficiently lower than the asset's expected fair value so that the exercise of the option appears reasonably certain. The fair value of the asset exceeds the lessor's cost of the asset. Therefore, the lease will be accounted for by the lessor as a(n):

A Sales-type lease. B. Financing lease. C. Operating lease. D. Guaranteed lease.