Answer:
C. to investigate those accused of disloyalty to the United States
Step-by-step explanation:
The primary focus of the House Un-American Activities Committee (HUAC) in the 1950s was to investigate those accused of disloyalty to the United States. The Committee had the authority to subpoena witnesses and documents and to refer cases for criminal prosecution, which it often did. Its investigations targeted communists, socialists, and other political dissidents, as it sought to prove charges of treason or sedition.