Answer:
The correct answer will be option-Golgi apparatus.
Explanation:
Golgi apparatus is a part of the endomembrane system which is responsible for the modification and transport of the protein through vesicles.
The modification like glycosylation adds glycosyl donor-long sugar chains to another functional group of proteins. The congenital disorders of glycosylation affect the glycosylation process as the individuals lack an enzyme required for the glycosylation.
Since glycosylation of proteins takes place in the Golgi apparatus, the option-Golgi apparatus is the correct answer.