Lonny (37) 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 was finalized on October 31, and Lonny did not remarry before the end of the year. Lonny provided all the support for his son, who lived with him all year and is his qualifying child. Lonny's most advantageous filing status is_________.

A. Single.
B. Married filing separately.
C. Married filing jointly.
D.Head of household.