The passage demonstrates the use of propaganda primarily through the option:
It uses scapegoating by blaming Snowball for actions he is not responsible for.
In this context, Napoleon and the other pigs are manipulating the narrative about Snowball to consolidate their power and deflect responsibility. By portraying Snowball as a traitor who fought on the side of the humans, they redirect the animals' anger and distrust away from themselves and onto Snowball, who is already vilified. This tactic is a classic example of scapegoating, as it unjustly blames Snowball for failures and problems within the farm, reinforcing the authority of Napoleon and the pigs.