Based on the arguments given, the best option is that A)If the equilibrium quantity of calzones increases, then the supply shift in the market for calzones must have been larger than the demand shift.
The number of those selling calzones has increased which would lead to the Supply curve shifting right. This will lead to an increase in the equilibrium quantity.
The increase in the complimentary good of beer led to a fall in price and equilibrium quantity as the demand curve shifted leftward.
If the equilibrium quantity increases then it means that the effect of supply increasing was more than the effect of demand decreasing to the extent that it overrode the decreased quantity as a result of reduced demand.
In conclusion, option A is correct.
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