Answer: The correct answer is C) To move proteins and other substances through the cell.
The organelle labelled 'F' in the given diagram is Endoplasmic reticulum. It is a specialized organelle present in eukaryotic cells, which is made up system of interconnected membrane- enclosed sacs ( cisternae). It is present in continuity with the outer membrane of the nucleus.
It serves many function to the cell like folding of proteins, transport of proteins and other substances through the cell.