Joan,45 Years Old and Unmarried,contributed $1,200 Monthly in 2011 to the Support

Joan,45 years old and unmarried,contributed $1,200 monthly in 2011 to the support of her parents' household.The parents lived in an apartment rented by Joan and their income for 2011 consisted of $800 in interest.What is Joan's filing status and how many exemptions should she claim on her 2011 tax return?

A) Single and 3 exemptions
B) Head of household and 1 exemption
C) Single and 1 exemption
D) Head of household and 3 exemptions
E) None of the above