The correct option is B Density and composition of the material
X-rays is a technique is used in radiography in which electromagnetic radiation differentially penetrate tissues inside the body and create images of these structures on photographic film. The greater the density of the material that the X-rays pass through, the more rays are absorbed. Therefore bone absorbs more X-rays than muscle or fat and tumors absorb more X- rays than surrounding tissue. Thus, the correct answer is option B.