5. Taxpayer, who was divorced on January 2, 2021, had an unmarried son, age 15, living in her home for the entire year of 2021. The cost to maintain Taxpayer's home was $12,000 for 2021. Taxpayer provided $8,000 of the cost. The remaining $4,000 was provided by Taxpayer's ex-spouse. Taxpayer provided more than one half of the son's total support, however, and claims the dependency deduction for the child. What is the most advantageous filing status for which Taxpayer may qualify? Head of household A B Married filing separate C Single D Abandoned spouse E Some other available filing status