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In 2020, Clark filed Form 1040 for the 2019 taxable year. Clark did not itemize his deductions. In 2020, Clark received a state income tax refund of $900 plus interest of $10 for overpayment of 2019 state income tax.What amount of the state tax refund and interest is taxable in Clark's 2020 federal income tax return?
A. $0
B. $10
C. $900
D. $910