Special Taxes for High$-$Income Taxpayers $($LO $6\mathrm{.}7)$

Christine and Vasu are married. In $2023,$ Christine earns a salary of $$250,000$ and Vasu earns a salary of $$75,000.$ They have no other income and work for the same employers for all of $2023.$ How much $0\mathrm{.}9$ percent Medicare tax for high$-$income taxpayers will Christine and Vasu have to pay with their $2023$ income tax return?

a$.$ $$0$

b$.$ $$225$

c$.$ $$450$

d$.$ $$675$