Which of the following is the most complete list of animals that have both a central nervous system (CNS) and a peripheral nervous system (PNS)?

Options

A. Hydra, planarian, earthworm, rabbit, human
B. Planarian, earthworm, rabbit, human
C. Earthworm, rabbit, human
D. Rabbit, human

Explanation

To determine which option contains the most complete list of animals that have both a central nervous system (CNS) and a peripheral nervous system (PNS), we need to analyze each option based on the characteristics of the animals listed.

### Step-by-Step Solution:

1. **Understanding CNS and PNS**:
- The Central Nervous System (CNS) consists of the brain and spinal cord.
- The Peripheral Nervous System (PNS) includes all the nerves outside the CNS, connecting the CNS to the rest of the body.

2. **Analyzing the Options**:
- **Option A: Hydra, Planaria, Earthworm, Rabbit, Human**
- Hydra and Planaria do not have a proper brain and therefore lack a complete CNS. Thus, this option is incorrect.

- **Option B: Planaria, Earthworm, Rabbit, Human**
- Again, Planaria does not possess a complete brain, so this option is also incorrect.

- **Option C: Earthworm, Rabbit, Human**
- Earthworm has a simple brain and a ventral nerve cord, which qualifies as having a CNS and PNS. Both Rabbit and Human have a well-defined brain and spinal cord. Therefore, this option is correct.

- **Option D: Rabbit, Human**
- While both Rabbit and Human have a CNS and PNS, this option does not include Earthworm, which also qualifies. Thus, this option is not as complete as Option C.

3. **Conclusion**:
- The most complete list of animals that have both a CNS and a PNS is **Option C: Earthworm, Rabbit, Human**.

### Final Answer:
**Option C: Earthworm, Rabbit, Human**