Explanation

Strontium-90 is a calcium mimic that lodges in bones and teeth; iodine-131 concentrates in the thyroid gland; cesium-137 distributes through soft tissues like potassium. All three are fission products released in nuclear accidents and tests, and all enter the human body through contaminated food and water, causing cancers and physiological disorders. Hence all three of the given radioisotopes are implicated.