Final answer:
Angela exhibited instrumental aggression to obtain a toy from Bernie, while Bernie displayed hostile aggression by screaming 'I hate you!' in response to anger.
Step-by-step explanation:
Angela is demonstrating instrumental aggression, and Bernie is demonstrating hostile aggression. Instrumental aggression is motivated by achieving a goal and does not necessarily involve intent to cause pain. In this case, Angela's goal is to gain possession of the toy and she uses a threat to achieve it, which shows that her aggression is instrumental. On the other hand, hostile aggression is driven by feelings of anger with the intent to cause pain. Bernie's scream, 'I hate you,' is an impulsive reaction stemming from his anger towards Angela, which indicates hostile aggression.