Amylopsin acts upon

Mechanical and chemical reactions finish the digestive process. Different organs and digestive glands are involved. To finish the digestion, each organ secretes a separate material with a varied pH level. Salivary glands, gastric glands, liver, pancreas, and intestinal glands are a few examples of the several digestive glands.
 

1. First, salivary glands come in two different varieties: intrinsic and extrinsic. There are countless intrinsic salivary glands located throughout the oral tissues. These include the buccal glands on the inside of the cheeks, the labial glands on the inside of the lips, and the lingual glands on the tongue.
2. Gastric gland: Each gastric pit has two or three tubular gastric glands. 
3. Liver: The liver has several functions, including bile production and the emulsification and absorption of fats. produces the clotting agent prothrombin, the plasma protein albumin, and the anticoagulant heparin.
4. The pancreas has a globose head inside the duodenal curvature, a body in the middle, and a blunt, tapered tail on the left that extends to the spleen.
5. Pancreatic juice, a mixture of digesting enzymes released by secreting acini cells, exits the pancreas through a sizable main tube known as the pancreatic duct or duct of Wirsung.
6. When starch is exposed to an alkaline medium, pancreatic amylopsin enzymes work to break it down into simple sugar.

Hence, option D is the correct answer.