Answer:
C. Married filing jointly
Step-by-step explanation:
If a couple is married before the last day of the year, they have to present a tax return as married filing separately or jointly. Married filing separately is used by couples when they want to present their information on separate tax returns. Married filing jointly is when a couple decides to present their information on the same tax return. According to this, married couples wishing to file a single tax return must choose married filing jointly.