Yeah, cells have the same size but different shape
Diffusion things go from high to low concentration so if there's more sugar inside the potato water will go in because there's less water inside than outside.
Sunflowers are dicots because they have seed that have two cotillons, and two seed leaves of food for the embryo. They have really complex leaves with veins all over, not like monocots.
Hope this helped you with your questions.
I am sure the answer is A.
