Macy, a California resident, decided to adopt a child in 2019 and the adoption was finalized that same year. The child was a U.S. citizen and in the custody of a California public agency. In the year of adoption, she paid $10,000 for qualifying expenses directly related to adopting her child. She didn't claim any credit for the adoption on her 2019 return, but she heard the credit can be carried forward to future years. She had a balance due on her state return last year. How should Macy go about claiming the credit for child adoption costs on her state return?

A. She should amend her 2019 tax return to claim up to $2,500 credit and carry forward any excess to 2020 and any future years.

B. She should claim up to $2,500 credit on her 2020 return and carry forward any excess to future years.

C. She should claim the $5,000 credit on her 2020 return.