The correct answer is A) a poster featuring kids dressed in old-fashioned clothing.
Elijah is making a public service announcement to save a local historic building. The best way to help convey this message using a lighthearted tone would be a poster featuring kids dressed in old-fashioned clothing.
A public service announcement is the transmission of a social content message that is free of charge. The public message tries to capture people's attention and made them reflect on an important issue that affects citizens or society. It could be about public health, education or an emergency alert. In this case, in his effort to save a local historic building, Elijah can use a lighthearted public service announcement with a poster featuring kids dressed in old-fashioned clothing.