Light intensity decreases with distance, so photosynthesis rate should decrease.

Steps:

• Light intensity follows inverse square law: it decreases as distance from source increases.
• Photosynthesis rate increases with light intensity until saturation, but here intensity is limiting and decreasing.
• Expected data: oxygen bubbles per minute decrease as distance increases.
• Analyze sequences for consistent downward trend from closest to farthest distance.

Why C is correct:

• Sequence 65, 62, 51, 45, 4 shows steady decrease, matching reduced light intensity limiting photosynthesis rate.

Why the others are wrong:

• A: Irregular pattern with increases, not consistent decrease.
• B: Rises to peak then falls, suggesting non-monotonic intensity.
• D: Decreases then rises, contradicting distance effect.

Final answer: C