The answer is: The animals are endowed with human characteristics and motivations.
A fable is a story in which animals are represented as possessing human characteristics and qualities in order to express a point of view, usually of a moral nature. In <em>Animal Farm, </em>Orwell depicts the events that led to the Russian Revolution of 1917 and then to Stalinism by making use of certain animal characters. Orwell was a harsh critic of any kind of authoritarianism, which, under Stalin, he believed Russia had fallen under this category.
Most fables<span> use </span>animals<span> to convey their lesson. A </span>fable<span> is usually “a brief, succinct story that is meant to impart a moral lesson”. So the third answer.</span>