What program must communities participate in to allow the sale of flood insurance?

The National Flood Insurance Program (NFIP) is the correct choice because it is specifically designed to enable communities to sell flood insurance. By participating in the NFIP, communities agree to adopt and enforce floodplain management ordinances that meet or exceed the federal standards. This participation ensures that homeowners and businesses in these communities have access to federal flood insurance, which is crucial in mitigating financial losses from flood events. Consequently, the NFIP plays a key role in reducing flood damage and encouraging responsible land use in flood-prone areas.

The other programs mentioned do not directly facilitate the sale of flood insurance in the same way the NFIP does. The Community Flood Resilience Program, Disaster Recovery Program, and Federal Emergency Response Program each serve different purposes related to disaster management and recovery, but they do not specifically address the sales framework of flood insurance established by the NFIP.