Four sepals `K_(4)` or (2 + 2) is the characteristic feature of the family :

Options

A. Solanaceae
B. Malvaceae
C. Papilionaceae
D. Brassicaceae

Answer

To solve the question regarding the characteristic feature of the family with four sepals (K₄) or (2 + 2), we will analyze the given options step by step.

### Step-by-Step Solution:

1. **Understanding the Question**:
The question states that the family in question has four sepals, which can be represented as K₄ or (2 + 2). This indicates a specific arrangement of sepals.

2. **Analyzing the Options**:
- **Solanaceae**: This family typically has five sepals.
- **Malvaceae**: This family also generally has five sepals.
- **Papilionaceae**: Members of this family usually have five sepals as well.
- **Brassicaceae**: This family is known for having four sepals arranged in two whorls (2 + 2).

3. **Identifying the Correct Family**:
From the analysis, the only family that fits the description of having four sepals (K₄ or 2 + 2) is **Brassicaceae**. This family is also known as the cruciferous family or mustard family and includes economically important plants like mustard and cabbage.

4. **Conclusion**:
Therefore, the correct answer to the question is **Brassicaceae**.

### Final Answer:
The family characterized by four sepals (K₄) or (2 + 2) is **Brassicaceae**.

---