Answer:
The correct answer is B. It made them aware of the government's lies about the Vietnam War.
Step-by-step explanation:
The Pentagon Papers revealed that the United States had not shown to the American public the real scope of the actions taken by their country in the Vietnam War through the bombings in Cambodia and Laos.
Daniel Ellsberg was the person who disclosed the study and he was accused of conspiracy and espionage but the charges were dismissed after an investigation about the Watergate scandal.
Finally, in 2011 the Pentagon Papers were released to allow the American public knowing the details about this study.