Explanation:
At a price of $4.00, the quantity is 1 + 5 + 8 = 14.
At a price of $2.00, the quantity is 0 + 3 + 4 = 7.
The quantity decreased by 7. So A and B are false.
Ann's supply curve is linear, so her change in quantity will be proportional to the price change. However, Barry and Charlie have nonlinear supply curves, so their change in quantity will not be proportional. So D is false.
Only C is true. At a price of $2.00, Charlie's quantity is 0.
