Why does a microwave oven heat up a food item containing water molecules most efficiently?

(N/A) microwave oven heats food items containing water molecules most efficiently because the frequency of the microwaves produced by the oven matches the resonant frequency of the water molecules.
When these microwaves interact with the water molecules,they cause the molecules to oscillate and rotate rapidly due to resonance.
This rapid motion leads to internal friction between the molecules,which generates thermal energy (heat) throughout the food item,resulting in efficient heating.