Four leaflets occurs in

Options

A. Sesbania
B. Oxalis
C. Marsilea
D. Dryopteris.

Answer

To solve the question "Four leaflets occur in," we will analyze the options provided and identify which one corresponds to four leaflets.

### Step-by-Step Solution:

1. **Understand the Concept of Leaflets**:
- Leaflets are the individual segments of a compound leaf. A compound leaf consists of multiple leaflets attached to a single petiole.

2. **Analyze Each Option**:
- **A. Sesbania**: This plant has 2 to 27 pairs of leaflets.
- **B. Oxalis**: This plant has a total of 3 pairs of leaflets.
- **C. Marsilia**: This plant is noted to have four leaflets.
- **D. Triopteris**: This plant has almost 20 leaflets.

3. **Identify the Correct Answer**:
- From the analysis, Marsilia is the only option that specifically has four leaflets.

4. **Conclusion**:
- Therefore, the correct answer to the question is **C. Marsilia**.