I believe that B and D are the only answers that I am sure of. C is incorrect and A seems incorrect as well. E may be a correct answer, but you will need to check the chemical equation. Hope this helps!
I would try to contain then kill all the lion fish. i would evaluate it by seeing how many dead lion fish body's i can get out of the water.
Answer:
He could create a schedule, block the extra things they do that isn't necessary, or even take a few breaks. When you take a break you relax your mind, and when you do that you stress less so you can be more productive.
Hope this helps and have a great day!