Medical imagery includes many methods that uses different technologies. X-ray technology is the most common one, which uses X-rays for generating results.
Medical imagery is a technique which doctor uses to find any defect inside the body. There are many techniques for this purpose, ex. computed tomography scans, MRI, X-rays, etc.
X-rays are form of electromagnetic waves which are absorbed by the body in different amounts.
Thus, B is the correct option.
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