Hen ________________ .

Options

A. undergoes external fertilisation
B. is oviparous
C. is viviparous
D. internal fertilisation

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks to fill in the blank regarding hens. We need to identify the correct term that describes the reproductive method of hens.

2. **Identifying the Options**: The options provided are:
- Undergoes external fertilization
- Is oviparous
- Is viviparous
- Internal fertilization

3. **Analyzing Hens' Reproduction**: Hens are birds that reproduce by laying eggs. This means they do not give birth to live young, which is characteristic of viviparous animals.

4. **Defining Oviparous**: Oviparous animals are those that lay eggs, from which the young hatch after a certain period. Since hens lay eggs, they fall under this category.

5. **Conclusion**: Based on the analysis, the correct term to fill in the blank is "is oviparous."

**Final Answer**: Hen **is oviparous**.

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