During the course of development, cells in various regions of embryo become variable in morphology and eventually perform diverse functions. This process is known as

Options

A. Rearrangement
B. Differentiation
C. Metamorphosis
D. Organisation

Explanation

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the process during embryonic development where cells become variable in morphology and perform diverse functions.

2. **Identifying Key Terms**:
- **Morphology**: This refers to the form and structure of cells.
- **Diverse Functions**: This indicates that cells are taking on different roles.

3. **Analyzing the Options**:
- **Rearrangement**: This implies a change in position or structure but does not specifically refer to the development of different functions.
- **Differentiation**: This is the process where unspecialized cells become specialized in structure and function.
- **Metamorphosis**: This generally refers to the transformation from a larval stage to an adult form, not specifically applicable to embryonic development.
- **Organization**: This refers to the arrangement of cells but does not specifically denote the change in function.

4. **Selecting the Correct Answer**: Based on the analysis, the most appropriate term that describes the process of cells becoming specialized in morphology and function during embryonic development is **Differentiation**.

5. **Conclusion**: The process during the course of development where cells in various regions of the embryo become variable in morphology and perform diverse functions is known as **Differentiation**.