Susan is writing a speech about the importance of recycling that she plans to present to her community leaders. which sentence would be the best supporting detail based on her purpose? a. air pollution is becoming a major problem in the world today. b. in 2006, there were more than $1.2 billion worth of recyclables thrown away. c. carpooling is a great way to cut down on the use of natural resources. d. large cities have a bigger problem with waste than small cities.