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The correct answer is C.
By every step of the series the butterfly and the flower change size. The dot(s) next to the butterfly defines how the flower changes size in the next step, the dot(s) next to the flower defines how the butterfly changes size in the next step.
One dot = size decrease incrementally in the next step.
Two dots = size increase incrementally in the next step.
Therefore, the correct answer is the image where the butterfly has increased in size and the flower has decreased in size. The number of dots in the answer image is irrelevant.