If True, Which of the Following Is the Best Evidence

If true, which of the following is the best evidence that the cyanelles are providing nutrition (in other words, calories) to the surrounding cercozoan?

A) if the cyanelle performs aerobic photosynthesis
B) if the vesicle membrane that surrounds each cyanelle possesses glucose-transport proteins
C) if the cyanelle performs aerobic respiration
D) if radiolabelled ¹⁴CO₂ enters the cyanelle and if, subsequently, radiolabelled glucose is present in cercozoan cytosol
E) if radiolabelled "heavy" water, ²H₂O, enters the cyanelle and if, subsequently, radiolabelled oxygen appears in cercozoan cytosol

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