Fill in the blank. The advantages of infrared waves are...? A. that they harden dental fillings and make vitamin D in the body. B. that they provide warmth and read information stored on computer...

Fill in the blank. The advantages of infrared waves are...? A. that they harden dental fillings and make vitamin D in the body. B. that they provide warmth and read information stored on computer disks. C. that they inspect packaged products and set broken bones. D. that they sterilized medical equipment and kill cancer cells.