Answer:
c. The deer leaped gracefully over the rabbit and ran into the forest.
Step-by-step explanation:
This sentence uses the active voice because the subject of the sentence, "the deer," is performing the action of "leaping" over the object, "the rabbit." The active voice is used when the subject of a sentence performs the action, as opposed to the passive voice where the subject receives the action. In contrast, options a, b, and d use the passive voice by placing the emphasis on the object of the sentence rather than the subject.