Answer: D) X-rays have a lower frequency than microwaves
Step-by-step explanation:
A scientific statement is the statement which is based on the evidences obtained after the experimental trails and direct observatory knowledge of nature. A scientific statement can be verified using suitable experimental methodologies.
D is the example of scientific statement this is because of the fact that the frequency of the microwaves and X-rays can be measured and compared. This involves the experimental and observatory approach hence it is a scientific statement.