The shampoo containing protein can not replace the protein in damaged hair because, the hair's polypeptide is built up from amino acids, so shampoo must contain them instead of proteins. That is option C.
Keratin is a type of fibrous protein found in the human and animal body which is commonly found at the scales, hair, nails, feathers, horns, claws, and hooves.
These proteins are generated from amino acids but shampoos made up of keratin are not made for amino acids.
Therefore, the shampoo containing protein can not replace the protein in damaged hair because, the hair's polypeptide is built up from amino acids, so shampoo must contain them instead of proteins.
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