The right answer is D. modifying, sorting, and packaging proteins prior to transport.
The Golgi apparatus is one of the organelles necessary for the production of functional proteins.
The Golgi apparatus is a eukaryotic cellular organelle.
The Golgi apparatus is a transit and reservoir for proteins and lipids made in the endoplasmic reticulum. This is part of the network of internal membranes that have put in place to transport macromolecules.
In particular, it makes it possible to add post-translational modifications to the newly synthesized proteins.