John, Age 25, Is a Full-Time Student at a State

John, age 25, is a full-time student at a state university. John lives with his unmarried sister, Ann, who provides over half of his support. His only income is $4,200 of wages from a part-time job at the college book store. What is Ann's filing status for 2016?

A) Single
B) Head of household
C) Married, filing separately
D) Qualifying widow(er)
E) None of the above