Answer:
The correct answer is option A. "Abdominal radiograph".
Step-by-step explanation:
Abdominal radiograph, or abdominal x-ray, is a diagnosis tool at which an image of the abdominal cavity is obtained based on the exposure of a small dose of ionizing radiation. The patient described in the question could be suffering from different conditions based on its symptomatology. The first tool to help to make a proper diagnosis is to perform an abdominal radiograph, to see any internal evidence of the possible cause of the occasional bloody diarrhea and abdominal pain.