听力原文： Thank you all for coming today to hear about the new recycling program on campus. Right now all recycling is voluntary, but in the near future, it will most likely be mandatory. The recycling we have planned is really a 3-part program. Sorting, collecting and distributing. The first part sorting is the hardest to get people to do. Most people don't like to take the time to separate their trash. This is usually where most recycling programs fail. However we are determined to make ours work. Instead of seeing the usual brown trash cans all over the campus, from now on you will see different colors of trash cans. Pink trash cans are for paper; green cans are for glass; maroon ones are for metal and white ones are for all other wastes. Just remember pink paper; green glass; maroon metal and white waste. After the trash is sorted, it needs to be collected and then distributed to the correct recycling facilities. That's where all of you come in. Since this pro- gram is still a volunteer program, we are asking students to give a little of their time to the project, probably no more than 6 hours per person each week and again your job will be to collect and sort the trash and take if to the different centers for each type of trash. If you are willing to help us with the program by giving 6 hours a week, Please write your names and phone numbers on this notepad.
What's the main purpose of this talk？

A. To explain why recycling important.
B. To describe the recycling program.
C. To discuss whether or not recycling should be mandatory (命令性的).
D. To explain how to find the recycling facilities.