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A student is revising the sentence below. When I started feeling tired and run down, I made sure to get lots of sleep, drink plenty of fluids, take my vitamins, and perform other preventive measures against getting a cold.
Which of the following would be the best replacement word for preventive?

Damaging: causing injury

Protective: covering or shielding from injury

Sedative: having a calming effect

Soothing: creating a feeling of calm or comfort