Kathy, who is divorced and supported her roommate, is eligible for which filing status?

Kathy's filing status can be better understood by examining the definitions and criteria of each option available.

For Kathy to file as Head of Household, she must be unmarried and maintain a home that is the principal residence of a qualifying person, such as a dependent. While Kathy is divorced, the question does not state that her roommate qualifies as a dependent or that she meets the necessary criteria to claim Head of Household.

The Single filing status is appropriate for individuals who are unmarried, including those who are divorced. As Kathy is divorced and not eligible for any other special classifications, Single is indeed a fitting choice.

Married Filing Separately would not apply in this case since Kathy is officially divorced and not married, making that status impossible for her.

Qualifying Surviving Spouse is only applicable to those who have lost a spouse and meet certain conditions, including having dependent children. Kathy's situation does not meet these criteria, as she is divorced and does not have the necessary dependent requirements associated with this status.

Thus, the best fitting filing status for Kathy is Single, considering her marital status and support obligations.