Which option, when applied to a rule, allows traffic to VPN gateways in specific VPN...

The option that allows traffic to VPN gateways in specific VPN communities is Specific VPN Communities4. This option enables you to define which VPN communities are allowed in the rule. All Connections (Clear or Encrypted) allows traffic to any destination, regardless of whether it is encrypted or not. Accept all encrypted traffic allows traffic to any encrypted destination, regardless of the VPN community. All Site-to-Site VPN Communities allows traffic to any site-to-site VPN gateway, regardless of the VPN community4. Therefore, the correct answer is C. Specific VPN Communities.