To determine which letter on the graph shows the greatest rate of photosynthesis as a function of light intensity, I would need to visualize the graph you're referring to. Typically, in a graph depicting the relationship between light intensity and the rate of photosynthesis, the curve increases with light intensity to a certain point before plateauing or declining.
If you could describe the graph or provide specific characteristics of the points labeled A, B, and C, I could help you identify which point corresponds to the greatest rate of photosynthesis. Otherwise, the answer will depend on the visual information provided, which I currently cannot see.
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