An apple-like fruit has been cultivated and we call it a peel. The peel contains a small amount of pesticide residue. However, experts suggest that we should not peel the fruit before eating it, because this kind of fruit The peel contains a special vitamin, which is very small in other fruits and is very good for human health. It is a pity to discard it. Which of the following, if true, would best challenge the experts' suggestions? ['Absorbing pesticide residues on the skin of the peel is more harmful to the human body than absorbing the vitamins in the skin of the skin.', 'The amount of pesticide residue on the peel is too small to cause harm to the human body.', 'Pesticide residues on the peel cannot be washed away.', 'The vitamin in the peel cannot be fully digested and absorbed by the body.']