1. reusing
2. incineration
3. source reduction
4. recycling
hope this helps! although I do believe it is one of those opinion questions where no answer is wrong.
explanation: I believe that reusing and incineraton are the two best because they are the least wasteful. And while source reduction and recycling are good they aren't quite as efficient as the other two. Plus they are more time consuming.
Answer:
There is so much to learn about, and it is hard to explain most of it, because we don't know why are bodies does some of the things it does.
I believe it is A. You should cover all the elements you can find in the piece. Sorry, I am really not so sure but that seems like the best bet!