$$Trevor$,$ a single taxpayer, received $$170,000$ in wages from his employer through November $30,2023.$ On December $1,2023,$ the employer pays Trevor a $$50,000$ bonus. Prior to December $1,$ the employer was not required to withhold the Medicare tax surcharge. On December $1,$ the employer is required to withhold Additional Medicare Tax on what amount of the $$50,000$ bonus?

A$.$ $$10,000$

B$.$$$20,000$

C$.$ $$30,000$

D$.$$$50,000$