Explanation:

- The given group of words is "a place where fish are kept."

- Option 1: Aviary

- An aviary is a large cage or enclosed space where birds are kept and allowed to fly freely. Therefore, it does not relate to fish.

- Option 2: Aquarium

- An aquarium is a tank or pool where fish and other aquatic animals and plants are kept for display, research, or as pets.

- This is the correct answer.

- Option 3: Herbarium

- A herbarium is a collection of preserved plant specimens and associated data used for scientific study. It has no connection to fish.

- Option 4: Zoo

- A zoo, or zoological park, is a facility where animals are kept in captivity for public display and conservation. While it may have an aquarium section, it generally refers to land animals.

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