A polar molecule with both a positive and a negative charge, water has both. The water rolls down on the skin as it contains non-polar lipid molecules. Thus, option D is correct.
Polar molecules are formed due to the electrical pole created by the positive and the negative charges on the opposite ends of the molecules. They have a polar bond formed due to the difference between electronegativity.
The polar molecules attract the polar molecules but repel the non-polar molecules. The dermis and the epidermis of the skin are made of non-polar lipid molecules.
The non-polar lipid molecules act as repellant that does not allows the polar water molecule to form a bond and hence the water just rolls on the skin, also the lipids do not allow the water to stay.
Therefore, the polar water molecules roll on the skin due to non-polar lipid molecules.
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