According to the article above, how does the fluoride content of bottled water compare to tap water?

Question

A.
Bottled water is more expensive than tap water because of fluoride.
B.
Bottled water contains safer forms of fluoride than tap water.
C.
Bottled water often has no fluoride, whereas tap water does.
D.
Bottled water usually contains more fluoride than tap water.

Answer 1

C. Bottled water often has no fluoride, whereas tap water does.