The condition under which a microwave oven heats up a food item containing water molecules most efficiently is

1. A. The frequency of the microwaves must match the resonant frequency of the water molecules
2. B. The frequency of the microwaves has no relation with natural frequency of water molecules
3. C. Microwaves are heat waves, so always produce heating
4. D. Infra-red waves produce heating in a microwave oven

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