Hypothesis I: A flavin pigment absorbs blue light; this pigment then activates the proton pump.Hypothesis II: When CO2 concentration rises, a membrane receptor inactivates the proton pump.Stomata closure in darkened environment, at time zero, with air (0.03% CO2) or CO2-free airflow through leaf. (Note: A decrease in conductance indicates inactivation of the proton pump.) 
A. Supports both hypothesis I and II.
B. Supports only hypothesis I.
C. Supports only hypothesis II.
D. Supports neither hypothesis.
Answer: C
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