Please help me answer this question. There are $2$ questins within the paragraph and a question at the end. Mortgage payments

Mortgages, loans taken to purchase a property, involve regular payments at fixed intervals and are treated as reverse annuities. Mortgages are the reverse of annuities, because you get a lump$-$sum amount as a loan in the beginning, and then you make monthly payments to the lender. mortgage for the remainder of the purchase price. Your bank has approved your $$800,000$ mortgage, and is offering a standard $30-$year mortgage at a $9\%$ fixed nominal interest rate $($called the loan's annual percentage rate or APR$).$ Under this loan proposal, your mortgage payment will be $$\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$ per month. $($Note: Round the final value of any interest rate used to four decimal places.$)$

Your friends suggest that you take a $15-$year mortgage, because a $30-$year mortgage is too long and you will pay a lot of money on interest. If your bank approves a $15-$year, $$800,000$ loan at a fixed nominal interest rate of $9\%($APR$),$ then the difference in the monthly payment of the $15-$year mortgage and $30-$year mortgage will be $$\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$

$?($Note: Round the final value of any interest rate used to four decimal places. $)$

It is likely that you won't like the prospect of paying more money each month, but if you do take out a $15-$year mortgage, you will make far fewer payments and will pay a lot less in interest. How much more total interest will you pay over the life of the loan if you take out a $30-$year mortgage instead of a $15-$year mortgage?

What is the correct answer?

A$.$ $$1,010,987\mathrm{.}89$

$B.$ $$1,096,664\mathrm{.}83$

$C.$ $$1,182,341\mathrm{.}77$

$D.$ $$856,769\mathrm{.}40$