Final answer:
The development of a low-cost electric automobile could lead to a leftward shift in the demand curve for gasoline by decreasing gasoline consumption in favor of electric vehicles, resulting in a lower equilibrium price and quantity for gasoline.
Step-by-step explanation:
Among the options provided, the development of a low-cost electric automobile might shift the demand curve for gasoline to the left. A significant technological advancement in transportation, such as an accessible electric vehicle, can cause consumers to opt for electric cars over traditional gasoline-powered ones. This switch would reduce the need for gasoline, as more fuel-efficient electric cars imply less reliance on gasoline for transportation. Consequently, this decrease in gasoline demand leads to a leftward shift in the demand curve, which, in turn, results in a lower equilibrium price and quantity of gasoline.