Joan, who was divorced in 2019, had filed a joint tax return with her husband in 2018. During 2019, she did not remarry and continued to maintain her home in which her five dependent children lived. In the preparation of her tax return for 2019, Joan should file as: 

a. A single individual 

b. A qualifying widow(er) 

c. Head of household 

d. Married, filing separately 

e. None of the above