Use the following information to answer the questions below.
You have learned about research conducted during the 1930s by van Niel,who studied photosynthesis in bacteria,which were observed to not release O₂ even though they fixed CO₂.
-These organisms were confounding because the prevailing hypothesis at that time was that
A)autotrophs released O₂ from the splitting of CO₂ to make sugars.
B)autotrophs didn't use CO₂.
C)CO₂ was released and oxygen used up during photosynthesis.
D)only heterotrophs released O₂ while fixing carbon.
E)the process of photosynthesis was unknown at this time.