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