The correct option is
C Protein synthesis
Ribosomes on the rough endoplasmic reticulum are called as 'membrane-bound' and are responsible for the assembly of many proteins. This process is called as translation. Certain cells of the pancreas and digestive tract produce a high volume of protein as enzymes. Many of the proteins are produced in quantity in the cells of the pancreas and the digestive tract and function as digestive enzymes.Thus, the correct answer is 'Protein synthesis'.