Which of the following taxpayers does not have to file a tax return for 2018? 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 student, age 22, with unearned income of $2,500 who is claimed as a dependent by her parents. d.A qualifying widow (age 67) with a dependent child and income of $18,800. e.All of these choices are correct.