Answer: a. no residual value and depreciate over the term of the lease
Step-by-step explanation:
A bargain purchase option allows the holder of a lease to be able to purchase the leased asset at the end of the lease period. This is for finance leases not for operating leases so if there isn't one, the lease becomes operating.
When there is no such option, the company leasing the asset will not be able to record a residual value (which is the value they would have bought it at) but instead will have to depreciate the lease over its term leading to higher depreciation amounts.