Synonyms: consequently, so, as a result, hence, thus, accordingly, for that reason, ergo, that being the case, on that account;
C. The horses pulled the wagon up the hill trotted down the other side, and then paused to rest at a stream.
The term comrade in Animal Farm is important because it means a friend who is also an equal, as the other answer notes. However, its main importance is its contribution to the allegory of the story. Comrade is the official title used among people in Communist countries such as the Soviet Union. Animal Farm is a metaphor for the rise of the Soviet Union, and so the term comrade is used by the animals to refer to one another.