The Katrina disaster in New Orleans decreased the ability of oil companies to purify crude oil into gasoline. This caused: A. the supply curve for gasoline to shift inward. B. the supply curve for gasoline to shift outward. C. the quantity of gasoline demanded to move out along the demand curve. D. the quantity of gasoline supplied to move in along the supply curve.

the supply curve for gasoline to shift inward. 

Explanation:

As a result of the Katrina disaster in New Orleans which decreased the ability of oil companies to purify crude oil into gasoline, the supply of gasoline would fall.

This would lead to a leftward or inward shift of the supply curve.

The demand would not be affected by this event.

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you have to put the parentheses like this:

in fact, you have to perform the operation inside parentheses first, and then proceed in order: