Radioisotopes are used to preserve food because radioisotopes:

dry out the food and make the food less susceptible to bacteria and mold infestation

can kill the bacteria, mold, insect eggs and yeast that cause food to spoil quickly

make the food radioactive so no bacteria or mold can grow on the food

can keep the food from spoiling indefinitely

The best and most correct answer among the choices provided by your question is the second choice or letter B.

Radioisotopes are used to preserve food because radioisotopes: can kill the bacteria, mold, insect eggs and yeast that cause food to spoil quickly.

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