carries dissolved oxygen easily erodes sediments is made of natural gas can be recycled by nature over time
I gave my students this multiple choice question: Moving water in a river is considered a renewable resource because it

Only one answer is correct among these 4 choices:
- carries dissolved oxygen
- easily erodes sediments
- is made of natural gas
- can be recycled by nature over time

Could you tell me which one is correct?

can be recycled by nature over time