For reaching people with long commutes and a focus on car ownership, the most effective advertising media would be:
c. billboards and radio ads
Reasons:
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Billboards: These are strategically placed along highways and busy roads where commuters can see them while driving. They are a great way to capture the attention of drivers, especially those who spend long periods on the road.
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Radio ads: Many people listen to the radio during their commutes. Engaging radio advertisements can target your audience effectively and provide an opportunity for regular reinforcement of your messaging.
While other options have their merits, billboards and radio ads are particularly suited for reaching commuters in vehicles.