The cells in your pancreas produce insulin which needs to be sent to the rest of your body to tell your cells to take in glucose (sugar) for energy. In order to get sent out of the pancreas’ cells, the insulin needs to go through the Endoplasmic reticulum. Thus, option "D" is correct.
ROUGH ENDOPLASMIC RETICULUM:
Rough Endoplasmic Reticulum (RER) is endoplasmic reticulum studded with ribosomes.
Ribosomes are the protein factories of cells. Hence RER is responsible for forming proteins.
Therefore, rough endoplasmic reticulum will be present in large amounts in cells responsible for producing substances rich in proteins like beta cells of pancreas.
Thus, option "D" is correct.
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