Arrange the following in correct order.
1. Assimilation
2. Absorption
3. Ingestion
4. Digestion

Options

A. 2, 1, 3, 4
B. 4, 3, 1, 2
C. 3, 4, 2, 1
D. 3, 4, 1, 2

Explanation

To arrange the processes of digestion in the correct order, we can follow these steps:

1. **Ingestion**: This is the first step where food enters the digestive system through the mouth. It marks the beginning of the digestive process.

2. **Digestion**: After ingestion, the food undergoes digestion, which involves breaking down the food into smaller particles and chemically converting it into a form that can be absorbed by the body.

3. **Absorption**: Once the food has been digested, the next step is absorption. This is the process where the digested food molecules move through the walls of the intestine into the bloodstream or lymphatic system.

4. **Assimilation**: Finally, assimilation occurs when the absorbed nutrients are utilized by the body’s cells for energy, growth, and repair.

Putting these steps together, the correct order is:
1. Ingestion
2. Digestion
3. Absorption
4. Assimilation

Thus, the correct sequence is 3 (Ingestion), 4 (Digestion), 2 (Absorption), and 1 (Assimilation), which corresponds to option C: 3421.