INTEREST FROM NHAI REC TAX SAVING BONDS

Hi

I sold a property is Sept 2019, and invested part of the proceeds in NHAI / REC bonds to reduce my Capital Gains liability.

The first interest payment was paid into my SB account in April 2020.  I know that I have to  pay tax on the interest received.  My doubt is do I have to declare this amount in 

A.  Assessment year 2020/2021 (financial year 19/20)

                                OR

B.  Assessment year 2021/2022 (financial year 2020/2021)

Thankyou