You Are the Leader of an Environmental Organization Working to Address

You are the leader of an environmental organization working to address the problem of climate change.Given the free rider problem,what would be the most effective way to get others to join your cause?

A) Describe the harmful consequences of global warming.
B) Explain how future generations will benefit from enacting climate change legislation.
C) Offer a cool T-shirt to those who pay their membership dues.
D) Publicly criticize those who don't join the campaign.