Read this excerpt from the text. This excerpt tells readers that water for public water systems is
A safe enough to drink without any treatment.
B safe to drink only if it has been kept cool.
C checked for substances that can harm people.
D best when it comes directly from an ocean.
The correct answer is C: checked for substances that can harm people.
Explanation: Public water systems conduct tests to ensure that the water is free from harmful substances, making it safe for public consumption. This means that regular checks are performed to safeguard water quality, which is crucial for health and safety. If you have more questions or need further help, feel free to ask!