Which Technology Is Currently the MOST Common for Large-Scale Energy $\degree$

Which technology is currently the MOST common for large-scale energy storage?

A) pumping water uphill to a reservoir when energy is plentiful, then allowing water to run downhill through hydropower turbines to generate electricity when energy is scarce
B) pumping compressed air into underground caverns when energy is plentiful, then releasing air to turn a turbine to generate electricity when energy is needed
C) heating salt to temperatures in excess of 1,000 $\degree$ F when energy is plentiful, then using this hot salt to heat water for a steam turbine to make electricity when energy is scarce
D) charging batteries with electricity that is produced from wind turbines and rooftop solar panels, then consuming the battery power when the Sun sets and the wind stops blowing