In New York City,the Entire Subway System Shut Down Due

Multiple Choice

In New York City,the entire subway system shut down due to massive power outage.People who usually took the subway were stranded and had to find alternate transportation.Police provided assistance and directions to the people.The assistance by the police here is an example of:

A) all of these.
B) providing a service.
C) enforcing the law.
D) maintaining order.