Final answer:
The Federal Bureau of Investigation (FBI) is the most likely agency to enforce criminal code and respond to silent alarms.
Step-by-step explanation:
The entity that enforces criminal code and responds to silent alarms depends on the specific jurisdiction and type of crime. However, among the options given, the Federal Bureau of Investigation (FBI) is the most likely agency to fulfill both roles. The FBI is a federal law enforcement agency responsible for investigating and enforcing federal criminal laws and also responds to various criminal activities and emergencies, including silent alarms.