To reach large numbers of people effectively, the best options among the three listed would typically be:
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Broadcast media: This includes television and radio, which have the potential to reach millions of viewers and listeners in real-time. Broadcast media is often considered one of the most effective ways to deliver a message to a large audience quickly.
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Outdoor media: Billboards, transit advertising (like buses and subways), and other outdoor placements can reach a wide audience, especially in urban areas. They are particularly effective for brand awareness and targeting commuters.
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Print media: Newspapers and magazines can reach a large audience as well, but their effectiveness has declined in recent years due to digital alternatives. Print media can be more targeted based on the publication’s readership, but it often doesn't match the reach of broadcast or outdoor media in terms of sheer numbers.
In summary, for maximum reach, broadcast media is usually the most effective, followed closely by outdoor media, while print media is beneficial for specific demographics or niches.