John Wolf,who is 45 years old and unmarried,contributed$2,000 monthly in 2015 to the support of his parents’household,which paid for more than 50%of the costs of maintaining that household..The parents lived alone and their income for 2015 consisted of$2,400 from dividends and interest,and$9,600 from Social Security.Based on the above information,what is Wolf’s filing status for 2015,and how many exemptions should he claim on his tax return?
　　【选项】
　　A.Single and 1 exemption.
　　B.Head of household and 1 exemption.
　　C.Single and 3 exemptions.
　　D.Head of household and 3 exemptions.
　　【答案】
　　D
　　【解析】
　　This answer is correct.Wolf qualifies as a"head of household"because he is unmarried and provides more than half of the cost of maintaining a household for his parents,who must also qualify as his dependents.Both his parents qualify as dependents because Wolf provides more than half of their support,and their gross income(which excludes nontaxable Social Security)is less than$4,000.