A certain ore is 28.9 % nickel by mass. How many kilograms of this ore would you need to dig up to have 60.0 g of nickel?

Firstly, the water in the dams hold gravitational potential energy as they are above ground level. the gravitational potential energy is then transferred to kinetic energy as it falls, spinning the turbinethe turbine then spins the generator, which is a large magnet surrounded by metal coils. by doing this, the generator generates electricity. in this action, the energy transfer taken place is kinetic to electric energy

The answer is b because a,c,and d are opinons