The correct answer is: They promoted enlistment and other patriotic activities.
Explanation:
During World War II the entertainers were one of the main sources of obtaining information about the war and motivating people to support the war and participate in it. War propaganda was present in the radio, film, press, and music industries, both in its explicit and implicit forms. Its main objective was to maintain people's motivation on a high level and to represent to war as something useful and positive, in order to obtain support from the citizens and recruit more soldiers that would provide them the victory.
