Environment in which an animal lives is called its
Habitat
The correct option is A:
Explanation of the correct option:
Habitat- A habitat is a place where animals make their home, it has all the environmental conditions that an organism needs to survive.
Explanation of the incorrect options:
Option B:
It is a place where human lives permanently or semi-permanently.
Option C:
Reservoir- It is a large natural or artificial lake that is used for water supply.
Option D:
Resort- It is a place where one or many people go to enjoy their holiday.
Thus, the environment in which an animal lives is called its Habitat.