Why Don't Storms Over Land Have as Much Energy as Storms

Why don't storms over land have as much energy as storms over oceans?

A) Convection currents are intensified by the latent energy of condensation
B) Convection currents are intensified by the latent energy of warm dry air
C) High pressure cells are more common over oceans
D) There aren't as many low-pressure systems over land
E) None of these, storms over land have as much energy as those over oceans