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. 

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explanation:

wind is defined by the direction it blows from.   for example, a wind blowing from north to south is called a northerly wind.