Use the Following Information to Answer the Questions Below

Multiple Choice

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.
-From his experiments, van Niel concluded that

A) he must have done something wrong.
B) something else was being used to provide hydrogen.
C) CO₂ was not being split to produce O₂.
D) CO₂ was directly involved in O₂ production.
E) H₂O was being used to provide hydrogen.