what type of detail wouild be best to support this topic

Question

statistics that show how pollution is lower in cities with carpooling
statistics that show how pollution is lower in cities with carpooling

statistics that show which cities are currently encouraging carpooling
statistics that show which cities are currently encouraging carpooling

discussion how carpooling can be a fun, if challenging, activity,

Answer 1

Discussion on how carpooling can help reduce traffic congestion and save money for participants.