“But they had not gone twenty yards when they stopped short. An uproar of voices was coming from the farmhouse. They rushed back and looked through the window again. Yes, a violent quarrel was in progress. There were shoutings, bangings on the table, sharp suspicious glances, furious denials. The source of the trouble appeared to be that Napoleon and Mr. Pilkington had each played an ace of spades simultaneously.

What can you infer from this passage?

The pigs and the humans were having a lot of fun together.
The animals did eventually find prosperity on Animal Farm.
The animals are preparing for another revolution.
Napoleon or Mr. Pilkington cheated during their game of cards.