Final answer:
The writing prompt that requires the most preparation and research is about the effectiveness of anti-smoking advertisements with America's youth.
Step-by-step explanation:
The writing prompt that would likely necessitate the most preparation and research is option C: How effective are anti-smoking advertisements with America's youth?
This prompt requires gathering data on the effectiveness of anti-smoking advertisements, understanding the target audience (America's youth), and conducting research on the various strategies used in these advertisements.
By conducting surveys, analyzing studies, and reviewing case studies, the writer would need to compile a comprehensive response supported by evidence to address the prompt.
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