Which sentence uses the word contaminants correctly?

1. Potential contaminants should let their instructors know if they are interested in applying to the university.

2. The contaminants were notified that they had advanced to the next round of competition.

3. The city ordered that the pond be closed to swimmers after it was found to be full of contaminants from a nearby factory.

4. The contaminants of the invasive pests is crucial to keeping the native plants healthy.

The sentence uses the word contaminants correctly is the city ordered that the pond be closed to swimmers after it was found to be full of contaminants from a nearby factory.

What are contaminants?

Contaminants are a substance that non-intentionally added to food, water or something that can cause harm to the organism.

Chemical contaminants are nitrogen, bleach, salts, metals, etc. and biological contaminants are bacteria, virus, plants and animals.

Thus, the correct option is 3. The city ordered that the pond be closed to swimmers after it was found to be full of contaminants from a nearby factory.

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