The Figure Below Shows Sueʹs and Carlosʹ Demand Curves for Gasoline

The figure below shows Sueʹs and Carlosʹ demand curves for gasoline. It would be useful to find the equation of the demand curves to answer the questions below.

-Refer to the figure above. If the price of gasoline is 3.00 euros per liter, the total quantity of gasoline demanded is ________ liters.

A) 1,600
B) 2,400
C) 4,300
D) 5,100