Final answer:
Sarah slammed and locked the door to prevent police officers from entering her home in response to a complaint about loud music.
Step-by-step explanation:
Sarah took action to prevent the police officers from entering her home by slamming and locking the door. This response would be considered an active measure to deny entry, potentially escalating the situation if the police deemed they had the legal right to enter, such as having a warrant or exigent circumstances like the presence of underage drinkers and loud music coming from her home. In real-life scenarios, this could prompt the officers to seek a warrant or use force to enter if they believe the law is being broken and entry is justified.