To determine which box size is NOT a viable option for packaging 36 cookies, we need to find out if 36 can be divided evenly by each of the box sizes listed.
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For 4 cookies per box: \( 36 \div 4 = 9 \) (This is viable.)
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For 6 cookies per box: \( 36 \div 6 = 6 \) (This is viable.)
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For 9 cookies per box: \( 36 \div 9 = 4 \) (This is viable.)
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For 10 cookies per box: \( 36 \div 10 = 3.6 \) (This is NOT viable since you cannot have a fraction of a box.)
Therefore, the box size that is NOT a viable option is 10 cookies per box.