Sergio and Malena were married for 10 years before Malena unexpectedly passed away in 2021. Sergio has a qualifying child dependent, Tomas (age 6), who lived with him all year. Sergio pays all the cost of maintaining the home for himself and Tomas. Sergio has not remarried. In 2021, Sergio filed his tax return as married filing jointly. Provided Sergio does not remarry by December 31 of the current tax year, what is Sergio's correct and most favorable filing status for 2022? Single. Married filing separately. Qualifying surviving spouse. Head of household