Step 1: Understanding the Concept
Vitamins are water-soluble (B-complex and C) or fat-soluble (A, D, E, K). The route of absorption depends on solubility.
Step 2: Absorption route
Water-soluble vitamins are absorbed in the small intestine and pass directly into the blood capillaries of the villi.
Step 3: Why the other options fail
Lacteals carry fats and fat-soluble vitamins. The stomach absorbs very little, and the large intestine mainly absorbs water.
Final Answer:
They are absorbed into the blood capillaries in the villi.
\[ \boxed{\text{(C) }\text{blood capillaries in the villi}} \]