Main framework of the trunk is constituted by 

Options

A. Skull
B. Vertebral column
C. Sternum
D. Ribs

Explanation

To answer the question "Main framework of the trunk is constituted by," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question is asking about the main structural component of the trunk in the human skeleton.

2. **Identify the Options**: The options provided are:
- Option 1: Skull
- Option 2: Vertebral column
- Option 3: Sternum
- Option 4: Ribs

3. **Analyze Each Option**:
- **Skull**: The skull is part of the head and does not constitute the trunk.
- **Vertebral Column**: This is the central structure of the trunk, extending from the base of the skull down to the pelvis.
- **Sternum**: The sternum is part of the rib cage but is not the main framework of the trunk.
- **Ribs**: Ribs are part of the thoracic cage and provide protection but are not the main framework.

4. **Determine the Correct Answer**: The vertebral column is the primary framework of the trunk as it supports the body and houses the spinal cord. It consists of 26 vertebrae arranged in a column.

5. **Final Answer**: Therefore, the main framework of the trunk is constituted by **Option 2: Vertebral Column**.