The treasury dealer division of an investment bank reports the following assets $($all amounts are in millions$)$: $30-$day T$-$bills$=$$$150,91-$day T$-$bills$=$$$275,6-$month T$-$notes$=$$$90,$ and $2-$year T$-$notes$=$$$350.$ It reports the following liabilities: $14-$day repurchase agreements$=$$$575$ and $1-$year commercial papers$=$$$290.$ What is the change in the dealer's net interest income $($NII$)$ in a year if the interest rates decrease by $50$ basis points?

A$.$

The dealer's NII will increase by $$2\mathrm{.}125$ million.

B$.$

The dealer's NII will decrease by $$350$ million.

C$.$

The dealer's NII will increase by $$1\mathrm{.}75$ million.

D$.$

The dealer's NII will decrease by $$2\mathrm{.}125$ million.