Answer:
B
Step-by-step explanation:
Bill of Attainder is a law that targets a specific individual or group with punishment.
A is not the choice since it doesn't target anyone; it just says anyone who crosses into private property to protest will be in trouble.
B is the choice since it targets communists
C is not the choice since it doesn't target anyone or any specific group
D is not the choice for the same reason as C