Answer:
I believe it would be these:
He can replace the 1.5-volt battery with a battery of higher voltage.
He can use a longer piece of wire that wraps more times around the bolt.
I'm not sure the others would work
The generation of electricity through nuclear energy reduces the amount of energy generated from fossil fuels. Less use of fossil fuels means lowering greenhouse gas emissions and others.
look at the photo, it wouldn't let me type it, sorry :-/
I think it would be D. because your hypothesis wasn't correct.
Most likely ATP next time put the answer choices in for multiple choice questions.