Correct Answer: Option A

Explanation

Pollination is the transfer of pollen grains from the male anther of a flower to the female stigma, either within the same flower or to another flower. 

From the diagram provided in the question, I - Petal  II - anther  III -stigma  IV - ovule. Hence, the transfer of pollen grain is from II to III.

See diagram above for better understanding.

There is an explanation video available below.

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