Explanation

Protoplasm is defined as the entire living content of the cell enclosed by the plasma membrane. It comprises the cytoplasm outside the nucleus together with the nucleoplasm inside the nucleus, and the organelles (mitochondria, ribosomes, plastids and others) embedded in the cytoplasm, which are themselves living functional components. The official answer key therefore takes the comprehensive option: cytoplasm, nucleoplasm and other organelles, option (D). The simpler 'cytoplasm and nucleoplasm' definition omits the organelles, which is why the key prefers (D).