Answer: out-group
Step-by-step explanation:
For Cassie, her vegan group can best be described as an out-group. An out-group simply refers to a social group whereby s particular individual doesn't identify.
In this case, since Cassie is in a state that's famous for its pork production while Cassie and her friends are vegans and actively protest against the consumption of meat. This implies that they're different from every other person and therefore are an out-group.