The standard deduction is a specific dollar amount that reduces the amount of income on which you're taxed and is Line 12a on the 2021 1040.
The form Line 7 reads "In each column, enter the full amount of your standard deduction from Form 1040 or 1040-SR, line 12." The 12b amount is for the charitable deduction for cash contributions made in 2021, which is an adjustment to income, and is not part of the standard deduction- so you do not use the 12c amount.
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