Social psychology began to emerge as the vibrant field it istoday during

• A. the depression of the early 1930s when researchers examined the effects of deprivation on aggression and altruism
• B. world war i when psychologists conducted studies of social conflict and cooperation
• C. world war ii when researchers performed studies of persuasion and soldier morale
• D. the korean war when psychologists examined the effects of brainwashing on prisoners of war