Answer:
A)Microwaves are electromagnetic waves. The microwave oven generates
these and directs them into the cavity where food is placed. The
microwaves act on the water molecules in food, and because the water
molecules are polar, they will attempt to orient themselves according
to the passing microwaves. Because the microwaves are waves, they have
crests and troughs, and these will cause the water molecules to "flip"
continuously. This generates heat, and the heat warms the food.