Marcus (32) is a U.S. citizen. He was married at the beginning of the current tax year. His wife lived in the household until September. Their divorce became finalized on November 11, and Marcus did not remarry before the end of the year. Marcus provided all the support for his son, who lived with him all year and is his qualifying child. Marcus's most advantageous filing status is?

Single.

Married filing separately.

Married filing jointly.

Head of household.