Floral formula of Brassica campestris is

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C.
D.

Explanation

To derive the floral formula for Brassica campestris, we will follow these steps:

### Step-by-Step Solution:

1. **Identify the Family**: Brassica campestris belongs to the family Brassicaceae (commonly known as the mustard family).

2. **Count the Sepals**:
- Brassica campestris has 4 sepals.
- These sepals are arranged in two whorls.
- Therefore, the representation for sepals is 2 + 2.

3. **Count the Petals**:
- There are also 4 petals in Brassica campestris.
- Similar to the sepals, the petals are arranged in two whorls.
- Thus, the representation for petals is also 2 + 2.

4. **Count the Stamens**:
- Brassica campestris has a total of 6 stamens.
- These are arranged in two whorls: 2 shorter and 4 longer.
- Therefore, the representation for stamens is 2 + 4.

5. **Identify the Gynoecium**:
- The ovary is superior and bicarpillary (meaning it has two carpels).
- The carpels are fused (syncarpous).
- Thus, the representation for the gynoecium is (2).

6. **Combine the Components**:
- Now, we can combine all the components to form the floral formula:
- The floral formula for Brassica campestris is represented as:
- **Floral Formula**:
- **K(2 + 2)** (for sepals)
- **C(2 + 2)** (for petals)
- **A(2 + 4)** (for stamens)
- **G(2)** (for the syncarpous bicarpillary ovary)

7. **Final Floral Formula**:
- The complete floral formula for Brassica campestris is:
- **K(4) C(4) A(6) G(2)** or **K(2 + 2) C(2 + 2) A(2 + 4) G(2)**.