How does an algal bloom deplete the oxygen supply?
A: The larger population of algae absorb all of the oxygen during the process of photosynthesis.
B: As the larger population of algae die, a larger population of decomposers use up oxygen while decomposing the algae.
C: The larger population of algae can no longer photosynthesize and release oxygen.
D: The larger population of algae cover the surface of the pond so oxygen does not get into the water.