please help, thank you

A lessee pays for a leasehold improvement. Estimated Life of the improvement: 7 years Remaining Lease Term: 5 years Renewal Option: 3 years The lessee estimates that there is a 30% possibility that the lessee will opt for the renewal. The leasehold improvement should be amortized over a. 7 years b. 5 years c. 8 years d. 10 years