The correct option is C reducing end and non reducing end, respectively
In a polysaccharide chain, the right end is called the reducing end and the left end is called the non reducing end.
In a protein chain, the amino acid present at the left end is the first amino acid and the amino acid present at the right is the last amino acid of the protein. The first amino acid is the known as the N-terminal and the last is known as C-terminal amino acid.