Amylase, renin, and trypsin are three classes of enzymes. Being enzymes, all three of them are proteinaceous in nature. Also, both renin and trypsin have roles in the digestion of proteins. Renin is secreted by the gastric glands, while trypsin is secreted by the pancreas. Amylases are found in saliva and pancreatic juice and acts on carbohydrates.
So, the correct answer is 'these all are proteins'.