Some understory plants in dense tropical rain forests have very large leaves. Which of the following is the most likely selective advantage of these leaves?

A) The higher oxygen concentration on the forest floor stimulates leaf growth.
B) High rates of photosynthesis from these large leaves lower carbon dioxide levels in the interior of the forest.
C) Low light levels slow photosynthesis but increase respiration rates to provide energy necessary for leaf growth.
D) Increased leaf surface area maximizes light absorption for photosynthesis under low light intensity.