The correct option is D M.R.I.
MRI or magnetic resonance imaging is a test that uses a magnetic field and pulses of radio wave energy to make pictures of organs and structures inside the body, In many cases, MRI gives different information about structures in the body that can be seen with an X-ray, ultrasound or CT scan.
Like, MRI of the chest can look at the heart, the valves and the coronary blood vessels. It can show if the heart or lungs are damaged. MRI of the chest may also be used to look for breast cancer.
Thus, the correct answer is option (D), 'M.R.I.'.