When a Suspension of Algae Is Incubated in a Flask

When a suspension of algae is incubated in a flask in the presence of light and CO₂ and then transferred to the dark, the reduction of 3-phosphoglycerate to glyceraldehyde 3-phosphate is blocked. This reaction stops when the algae are placed in the dark because

A) the reaction requires CO₂.
B) the reaction is exergonic.
C) the reaction requires ATP and NADPH + H⁺.
D) the reaction requires O₂.
E) chlorophyll is not synthesized in the dark.