Question

consider this claim: for the benefit of all citizens, fluoride should be added to drinking water. which is the strongest evidence to support the claim? more than half of americans have fluoride in their drinking water. some experts say that the fluoridation of water may threaten people who suffer from kidney disease. many experts agree that the fluoridation of water helps to prevent tooth decay.

Explanation:

The claim is about the benefit of adding fluoride to drinking - water. Evidence that many experts agree it helps prevent tooth decay directly supports the idea of its benefit for citizens. Just because more than half of Americans have it in their water doesn't mean it's beneficial. And evidence about it threatening people with kidney disease is against the claim.

Answer:

Many experts agree that the fluoridation of water helps to prevent tooth decay.