The Figure Below Shows the Supply Curves for Gasoline for Two

The figure below shows the supply curves for gasoline for two oil companies (MaxOil and MagnusPetro) . It would be useful to find the equations of the two supply curves to answer the questions below.

-Refer to the figure above.MaxOil can produce gasoline ________.

A) at a lower marginal cost than MagnusPetro up to the 1 millionth liter
B) at a higher marginal cost than MagnusPetro beyond the 1 millionth liter
C) at the same marginal cost as MagnusPetro up to the 1 millionth liter
D) at the same marginal cost as MagnusPetro beyond the 1 millionth liter