Elizabeth (27) is unmarried. Her younger sister, Seraphina (21) lived with her all year. Both have social security numbers that are valid for employment. Seraphina is not a student. Elizabeth paid all of her own support and the household expenses. She paid 78% of Seraphina's support and Seraphina paid for the balance of her support. Seraphina is not permanently and totally disabled. Elizabeth's 2021 earned income and AGI were $27,852 and her 2019 earned income was $24,393. Elizabeth did not have any foreign income or investment income. Seraphina's gross income was $3,793. Everyone listed is a U.S. citizen.

a- What is Elizabeth's correct and most favorable 2021 filing status?

b-What is Seraphina's dependency status for Elizabeth?

c-Is Elizabeth eligible to claim the Child Tax Credit and/or the Other Dependent Credit for any potential dependent? Choose the best response.

d-Is Elizabeth eligible for the Earned Income Credit?

e- is Elizabeth eligible to utilize the 2019 lookback provision for the Earned Income Credit