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(Nature Reserve): A protected area where animals and plants are kept safe from hunting and industrial activity.

Look for the preposition "об". In Russian, this almost always signals the Prepositional case when referring to the object of a thought or care. (Nature Reserve): A protected area where animals and

Case: — Caring about whom? About deer (Object with preposition "об"). Они подкармливают оленей зимой. (Nature Reserve): A protected area where animals and

Depending on the specific instruction in your edition, you usually need to write out the sentences and determine the of the word "олени" (deer). В заповедниках живут олени. (Nature Reserve): A protected area where animals and

The word "олени" in the first sentence is the subject, so it must be in the Nominative case.