Answer:
C. A smaller proportion of the last monthly payment will be interest, and a larger proportion will be principal, than for the first monthly payment.
Explanation:
I prepared a summary of an amortization schedule to explain this:
principal = $100,000
r = 8% annual
n = 360 months
first payment = $733.76: $666.67 are interests and only $67.09 reduces principal
second payment = $733.76: $665.95 are interests and only $67.54 reduces principal
last payment = $733.76: $4.90 are interests and only $728.86 reduces principal to $0