You may not need to correct this line. If the state/local refund was not taxable (included in Adjusted Gross Income) on your federal return, then there would not be anything to deduct on your MO return.
In the step by step interview under the "Income" tab in the "Other common income" section, you can enter the state/local refunds you received in 2021. If you itemized in 2020 be sure to indicate that. Once you complete that interview TurboTax will let you know if any of your refunds were taxable.
If none are taxable then zero is the correct entry line C (and line 9) of the MO-A form.
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