The line of code that successfully calculates and stores the number of leftover crackers in the final box is extras ← crackersPerBox - (neededCrackers MOD crackersPerBox).
From the complete information, her initial code is given as:
numHouses ← 15
crackersPerHouse ← 5
crackersPerBox ← 20
neededCrackers ← crackersPerHouse * numHouses
It was depicted that Amelie realizes that she'll need to buy more crackers since the crackers come in boxes of 20. Therefore, to calculate how many graham crackers will be leftover in the final box, the line of code from the options will be extras ← crackersPerBox - (neededCrackers MOD crackersPerBox).
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