While the chyme is present within the small intestine, glands within this structure begin to secrete different types of digestive enzymes, called carbohydrases (amylase, proteases, and lipases or fat splitting enzymes). The glands responsible for these enzymatic secretions are found in the mucosal layer of the small intestine, called the crypts of Lieberkuhn.

The correct answer is option 'D': Crypts of Lieberkuhn.

Explanation:
Carbohydrate splitting enzymes are involved in the breakdown of carbohydrates into simpler forms that can be easily absorbed by the body. These enzymes are secreted by various organs and tissues in the body.

1. Liver:
The liver is responsible for the production of bile, which helps in the digestion and absorption of fats. While the liver does secrete enzymes involved in carbohydrate metabolism, it does not secrete carbohydrate splitting enzymes.

2. Zymogen cells of gastric glands:
The gastric glands in the stomach secrete various enzymes and digestive juices to aid in the digestion of food. However, the primary function of these enzymes is to break down proteins, not carbohydrates. Therefore, carbohydrate splitting enzymes are not secreted by zymogen cells of gastric glands.

3. Spleen:
The spleen is an organ involved in the immune system and the filtering of blood. It does not secrete digestive enzymes, including carbohydrate splitting enzymes.

4. Crypts of Lieberkuhn:
The crypts of Lieberkuhn, also known as intestinal glands, are located in the lining of the small intestine. These glands secrete various enzymes, including carbohydrase enzymes, which are responsible for the breakdown of carbohydrates. The enzymes secreted by the crypts of Lieberkuhn include amylase, sucrase, lactase, and maltase, which break down starch, sucrose, lactose, and maltose respectively.

Therefore, the correct answer is option 'D': Crypts of Lieberkuhn. These glands secrete carbohydrate splitting enzymes in the small intestine, allowing for the proper digestion and absorption of carbohydrates in the body.

D as liver sec no enzymes for digestion ,in stomach no enzymes for carb. also spleen is not related with secretion of enzymes