Answer:
The correct answer would be option C.
The structure of the leaf is a result of different adaptations that help in increasing the efficiency of its function, that is, photosynthesis.
Different adaptations include flat and thin structure, presence of stomata, and waxy layer or cuticle.
Flat and thin structure helps in increasing the surface area of a leaf.
Large surface area ensures that maximum sunlight can fall on the leaf.
Increased sunlight increases the rate of photosynthesis.
Similarly, thin structure help in the easy transmission of sunlight from the surface to inside cells.
The inner layers of cells contain chloroplasts which convert solar energy into chemical energy.