Answer:
I hope this helps, if it doesn't help you please let me know, and I'll delete my answer!
Field - i think , it just makes the most sense
Since you say ‘which’ , in order to answer you, we would need the options you are given, but my answer would be
1. Not reusable
2. Might use up someday
3. Burning it will produce carbon dioxide and worsen global warming
Hope these can help :)
Answer:
lower power= 20 x 10= 200x
higher power= 20 x 43= 860x