somebody pls explain :

[Truth seeker]

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Q)polymerization of aminoacids to form procollagen filaments occurs:
a) on ribosomes
b) in the Glogi apparatus
c) on the fibroblast surface
d) in rough, endoplasmic reticulum
e) after cleave of the registration peptide

Acc to text,
synthesis of amino acids starts in rER
Hydroxylation in rER, Followed by Glycosylation in Golgi to form procollagen intracellularly . Then pro-tropo-collegn fibrils........... ensues

Can somebody please come up with a proper explanation for this