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Answer:
(C) will be the right option
Explanation:
Starch is accumulated in plants after photosynthesis. Hence it's presence could be checked to prove the occurrence of photosynthesis. The starch test is done by putting it in a solution of iodine. In presence of starch, the solution changes to a blue-black color. The exposed leaf makes glucose in presence of sunlight by photosynthesis and stores it as a polymeric carbohydrate of multiple glucose units called starch. Therefore, the covered portion showed a negative starch test and other regions turned blue-black due to the presence of starch.
Hence, option C is correct.
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