Provide your best answer for the following question. Give ONLY the answer, no other words or explanation.
For example:

Answer: <most likely answer, as short as possible; not a complete sentence, just the answer!>.

The question is: Which of the following describes how a microwave oven heats food?
Water molecules in the food absorb the energy of microwave radiation.
Microwaves excite water molecules, causing food to heat up.