Martin, a 50-Year-Old Single Taxpayer, Paid the Full Cost of Maintaining

Martin, a 50-year-old single taxpayer, paid the full cost of maintaining his dependent mother in a home for the aged for the entire year.What is the amount of Martin's standard deduction for 2018?

A) $12,000
B) $18,000
C) $19,600
D) $24,000
E) None of the above