3) D

1 – Microwaves do get absorbed by water molecules. An example of this when water molecules in food absorb microwaves from the microwave oven and heat up the food.

2 – The ionising properties of X rays means that they can damage the DNA in the cells of the human body.

3 – Infra red waves do not penetrate matter

Only statements 1 and 2 are correct so D is correct