aluminum. cardboard. plastic. glass.
I gave my students this multiple choice question: A scientist working on a new package design wants to use a material that is highly recyclable, biodegradable, and inexpensive. The best material for the package design is

Only one answer is correct among these 4 choices:
- aluminum.
- cardboard.
- plastic.
- glass.

Could you tell me which one is correct?

cardboard.