please help me solve these questions and provide work shown as well if needed, thank you

10. Avia, a widow whose husband died in 2015, maintains a household for herself and her 11-year-old daughter. Avia's most favorable filing status for 2020 is

A) single.

B) head of household.

C) married filing jointly.

D) surviving spouse.

11. Theresa, age 13, is a dependent of her parents (her parents provided over half of her support). Her only source of income in 2020 is $7,500 of interest income on bonds given her by her grandparents. Theresa's marginal tax rate is 10%, and her parent's marginal tax rate is 37%. Theresa's tax for 2020 is (kiddie tax rules for 2020)

A) $2,071.

B) $2,200

C) $6,400

D) $7,500.

12. Lincoln, age 14, is a dependent of his parents (his parents provided over half of his support). During 2020, Lincolns earned income from wages is $5,000 and Lincoln received $2,500 of interest income. The parent's marginal rate is 22% and Lincolns marginal rate is 10%. Lincolns tax is (kiddie tax rules for 2020)

A) $251.

B) $300.

C) $1,850.

D) None of the above.