can you please solve this with an explanation

1) Marc, a head of household, has AGI of $60,000 and $5,000 in interest from an investment in City of Birmingham bonds. Using the U.S. tax rate schedule for 2019, what is Marc's average tax rate (rounded) and marginal tax rate on $100 of additional taxable interest and $100 of capital gain, respectively? A. 12%; 12%; 12%. B. 11.5%, 12%; 12%. C. 12%; 12%; 15% D. 11.5%; 12%; 0%