Proteins are made up of amino acids. The amino acids are linked together by peptide bonds to form a protein. The amino acids consist of amine group made up of nitrogen and hydrogen and the carboxyl group at the end and a side chain of R group which is specific to a particular amino acid. Carboxyl is formed by carbon, oxygen, and hydrogen (COOH). Cysteine and methionine are the proteins which consist of sulphur.
So, the correct answer is option C.
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