What Is the Most Effective Method to Control the Spread

What is the most effective method to control the spread of communicable disease?

A) Isolate the infected person from all contact with noninfected persons.
B) Vigorously petition the community health department to increase spraying.
C) Administer prophylactic antibiotics to the rest of the family.
D) Demonstrate and monitor a return demonstration of a good hand washing technique by the family.