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: This option indicates that public water systems are monitored and tested to ensure that harmful substances are not present, which is essential for maintaining water safety for consumption. The other options suggest incorrect or less relevant conditions regarding water safety.