Im pretty sure it would be d.
Ammonia is the combination of Nitrogen and Hydrogen. also is N2 + 3H2 => 2NH3.
Hope this helps! :D
2C2H2 + 6O2 -> 4CO2 + 2H2O + heat
The answer is Velocity and potential energy. Kinetic energy is the total energy of a system or an object in motion and requires movement.