In 2018, Leo's wife died, Leo has two small children ages 2 and 4 living at home whom he supports entirely Leo does not remarry and is not claimed us a dependent on another's return during any of this period. In 2019,2020 and 2021, Leo's most advantageous filing status is, respectively A. head of household for all three years. O B. surviving spouse, surviving spouse, single OC. surviving spouse, surviving spouse, head of household OD. single for all three years