Is Demand for electricity is always the same.

How do the energy differences between the higher energy levels of an atom compare with the energy difference between the lower energy level of the atom

Iknow the answer is a but i don't know why

What stress will shift the following equilibrium system to the left? n2(g) + 3h2(g) ⇌ 2nh3(g) adding more n2(g) adding more nh3(g) increasing the pressure of the system reducing the volume of the container