Question

water fluoridation and cancer risk
what information allows you to conclude that this article is reliable? check all that apply.
more than 50 studies were conducted.
fluoride has been added to drinking water since 1945.
the us public health service was responsible for part of the study.

Explanation:

A large - number of studies (more than 50) can increase reliability due to more data points. Involvement of a reputable organization like the US Public Health Service also adds credibility. The fact that fluoride has been added to water since 1945 is just a historical statement and doesn't directly prove the reliability of the article about cancer risk.

Answer:

A. More than 50 studies were conducted.
C. The US Public Health Service was responsible for part of the study.