Which of the following is a man-made ecosystem?

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1. **Definition:** A man-made ecosystem is an environment created and maintained by humans.

2. **Evaluate each option:**
   - (1) **Aquarium** — constructed and maintained by people; it is a man-made ecosystem.
   - (2) **Desert** — a natural ecosystem formed by climate and geography.
   - (3) **Forest** — a natural ecosystem.
   - (4) **Grassland** — a natural ecosystem.

3. **Conclusion:** Only option $1$ (Aquarium) is man-made, which corresponds to choice **a**.

FINAL_ANSWER: a

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