Suppose over the next several years the productivity of firms producing electric cars Improves dramatically. The advance in productivity leads to

A、 a decrease in the supply of electric cars so that the supply curve shifts leftward.
B、 a decrease in the supply of electric cars so that the supply curve shifts rightward.
C、 an increase in the supply of electric cars so that the supply curve shifts leftward.
D、 an increase in the supply electric cars so that the supply curve shifts rightward.
E、 no change in the supply of electric cars, only a change in the quantity supplied of Electric cars.