The purpose of a generator is to convert: A. electrical energy to mechanical energy.
B. mechanical energy to electrical energy.
C. chemical energy to nuclear energy.
D. mechanical energy to chemical energy.

b (mechanical energy to electrical energy)

because mechanical energy is the generator. And it's majority is to convert mechanical energy to electrical energy

i would say b

explanation:

but i think i would need more information than that

they it depends on if one believes about radioactivity, they make a geiger counter beep but maybe it was going to beep anyway electronics do wierd things all the time or it was programmed to beep near certain metals.