In which one of the following sets of animals do all the four give birth to young ones

Options

A. Lion, bat, whale, ostrich
B. Platypus , penguin, bat, hippopotamus
C. Shrew, bat, cat, kiwi
D. Kangaroo, hedgehog, dolphin,

Explanation

To solve the question of which set of animals consists entirely of species that give birth to young ones (viviparous), we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Terms**:
- Viviparous: Animals that give birth to live young.
- Oviparous: Animals that lay eggs.

2. **Analyze the Options**:
- We need to evaluate each option to see if all four animals in the set are viviparous.

3. **Option 1**:
- Lion: Viviparous (gives birth to live young)
- Bat: Viviparous (gives birth to live young)
- Whale: Viviparous (gives birth to live young)
- Ostrich: Oviparous (lays eggs)
- **Conclusion**: This option is incorrect because of the ostrich.

4. **Option 2**:
- Platypus: Oviparous (lays eggs, exception among mammals)
- Penguin: Oviparous (lays eggs)
- Bat: Viviparous (gives birth to live young)
- Hippopotamus: Viviparous (gives birth to live young)
- **Conclusion**: This option is incorrect because of the platypus and penguin.

5. **Option 3**:
- Shrew: Viviparous (gives birth to live young)
- Bat: Viviparous (gives birth to live young)
- Cat: Viviparous (gives birth to live young)
- Kiwi: Oviparous (lays eggs)
- **Conclusion**: This option is incorrect because of the kiwi.

6. **Option 4**:
- Kangaroo: Viviparous (gives birth to live young)
- Hedgehog: Viviparous (gives birth to live young)
- Dolphin: Viviparous (gives birth to live young)
- All four animals in this option are viviparous.
- **Conclusion**: This option is correct.

### Final Answer:
The correct option is **Option 4**: Kangaroo, Hedgehog, Dolphin.

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