A and d are correct but I do not know b and c

Compute the standard deduction for the following taxpayers. If an amount is zero, enter "0" Click here to access the standard deduction table to use. a. Margie is 15 and claimed as a dependent by her parents. She has $1, 925 in dividends income and $3, 880 in wages from a part-time job. b. Ruby and Woody are married and file a joint tax return. Ruby is age 66, and Woody is 69. Their taxable retirement income is $11, 845. c. Shonda is age 68 and single. She is claimed by her daughter as a dependent. Her earned income is $510, and her interest income is $740. d. Frazier, age 52, is married but is filing a separate return. His wife itemizes her deductions