Final answer:
The Vietnam War influenced New Hollywood cinema, fostering film content that reflected societal disillusionment and a reassessment of American ideals. The correct answer is option c.
Step-by-step explanation:
The lingering culture shock that influenced the content of the New Hollywood cinema was c. Vietnam War. The Vietnam conflict profoundly affected American society, igniting a cultural revolution against the war, civil rights movements, and women's liberation. The disillusionment and opposition to government policies during and after the Vietnam War were reflected in the themes of many New Hollywood films, which often questioned traditional values, authority, and the American dream, and sometimes portrayed anti-heroes instead of traditional protagonists. This cinematic shift mirrored the nation's broader reassessment of its ideals and role in the world.