Are used to make images of bones inside the human body
a. gamma rays.
c. microwaves.
b. x-rays.
d. infrared waves.

The best answer is b :  X - rays

X- rays can described as powerful waves of electromagnetic energy. These waves are from the electromagnetic spectrum and their wavelength ranges between 0.01 - 10 nanometers.

They are used in various ways especially in the medical field and in security scanners at the airport.

They were discovered  by accident by a German scientist and physicist while he was working with a tube  in his laboratory.

He named them X-rays because he did not know the nature of the rays. X in  mathematics is used to designate an unknown value. 

this a false

explanation:

it is the second option.