Cyanobacteria are believed to generate the majority of oxygen gas in Earth's atmosphere. What allows them to produce oxygen?

A) photosynthesis in which H₂S is the electron source
B) photosynthesis in which water photolysis produces H⁺, e^-, and O₂
C) bacteriorhodopsin-based photosynthesis
D) being near the surface of a pond where more oxygen is available
E) possession of a variety of chlorophylls to absorb a wide range of wavelengths of light