A Machine That Cost $10,000 Was Purchased at the Beginning

A machine that cost $10,000 was purchased at the beginning of the current business year.Assuming that an equal amount of amortization will be recorded for each year of the machine's life at $800,the adjusting entry made at the end of the current business year should include which of the following?

A) an $800 credit to accumulated amortization.
B) an $800 credit to amortization expense.
C) a $10,000 credit to accumulated amortization.
D) a $10,000 credit to amortization expense.