Why does Orwell compare the animals to slaves? What literary device is used?

Excerpt from incredible oceans roberto barerra (1) the five major oceans—the arctic, the atlantic, the indian, the pacific, and the southern, which are then broken down into smaller seas—provide food for humans and animals, entice explorers, enable trade, and affect the climate and environment the world over. in this sentence from paragraph 1, the word entice means a) amaze. b) attract. c) exhaust. d) feed.