Protoplasm cytoskeleton is made by
The correct option is D Endoplasmic reticulum
Endoplasmic Reticulum was discovered by Porter and collaborators in 1945. It was given the present name by Porter in 1953. The endoplasmic reticulum is a system of membrane-lined channels found in all eukaryotic cells except mature erythrocytes provides structural support to the protoplasm.