Answer:
(C).Rough endoplasmic reticulum
Step-by-step explanation:
Endoplasmic reticulum (ER) is a membrane-bound cell organelle, present in eukaryotic cells. There are two types of endoplasmic reticulum, smooth ER and rough ER.
Rough ER contains ribosomes on its outer surface (side, which is in contact with cell cytosol), while in smooth ER surface, ribosomes are absent. This is because ribosomes provide platform for the process of protein synthesis or translation.
Proteins synthesized by ribosomes present in rough ER surface are then transported to it (rough ER) for sorting and post-transnational modifications.
Thus, the correct answer is option (C).