Photosynthesis Was a Major Evolutionary Milestone Because

Photosynthesis was a major evolutionary milestone because

A) photosynthetic organisms contributed oxygen to the environment, which led to the evolution of aerobic organisms.
B) photosynthesis led to conditions that allowed life to arise on land.
C) photosynthesis is the only metabolic process that can convert light energy to chemical energy.
D) photosynthesis provides food for other organisms.
E) All of the above