explain tnaks

Karla and Timothy are legally married. On September 15, 2020 they separated and have not inved min each other since that date. Karla does not want to file a joint return with Timothy because she does not want to be liable for his taxes. Karla provides 75% support to the children and pays the cost of maintaining their home. What is Karla's filing status for 2020 and 2021? Select one: O a. married filing separately and head of household. O b. head of household and single. O c. married filing separately for both years. O d. single for both years