Which of the following taxpayers is exempt from having to file a tax return for 2022? a. A single taxpayer who is under age 65, with income of $13,500 b. Married taxpayers (ages 45 and 50 years), filing jointly, with income of $26,000 c. A 22-year-old student with unearned income of $2,500 who is claimed as a dependent by her parents d. A 67-year-old surviving spouse with a dependent child and income of $18,900