Plz help Ahmed has to write a five-minute speech on ways to protect the environment for his social studies class. He has to deliver this to his sixth-grade classmates. Which of the following topics is the best because it is specific and appropriate for his audience?
A.
a detailed design and working of waste-disposal and recycling systems
B.
the United Nations' survey of recycling programs around the world
C.
a history of recycling programs and their success in the United States
D.
how recycling, especially at the school level, can help the environment