Which of the Following BEST Describes the Benefit to Early

Multiple Choice

Which of the following BEST describes the benefit to early photosynthetic organisms gained by having two different photosystems in one cell?

A) These organisms produced carbohydrates at twice the rate of organisms with a single photosystem.
B) They produced oxygen.
C) They could use water as an electron donor.
D) They could thrive in places where there was little or almost no light.