Question 13 of 15. All of the following taxpayers are U.S. citizens. None of them are dependents. Which is required return? Bob (40) and Janet (39), filing married filing jointly, $25,950 gross income. Bret (55), filing single, $11,550 gross income. Carson (66), filing head of household, $19,250 gross income. Joe (66) and Maria (65), filing married filing jointly, $26,500 gross income. Question 13 of 15. All of the following taxpayers are U.S. citizens. None of them are dependents. Which is required return? Bob (40) and Janet (39), filing married filing jointly, $25,950 gross income. Bret (55), filing single, $11,550 gross income. Carson (66), filing head of household, $19,250 gross income. Joe (66) and Maria (65), filing married filing jointly, $26,500 gross income