Mr. brown has gathered evidence that the self-esteem of students is negatively correlated with their typical levels of anxiety. before he uses this evidence to conclude that self-esteem reduces anxiety, mr. brown should first be reminded that

Correlation does not prove causation  

Explanation:

Correlation and causation are the two terms that are mostly confused and used interchangeably used. These terms are often misunderstood by people. It is very important to know that these terms are used for the conclusion. So that person has to make understand what is the correct meaning of these two terms. Correlation does not imply causation. It is very important to understand this term. Correlation is basically about the two variables. It tells how the two variable is linearly related to each other and change together. It does not tell about how it is related but it tells about the relationship between the variables. Causation is a little bit more than a correlation. It tells about change in one variable that will cause a change in another variable.

a would be the answer

she recieved a treatment not thought to be specifically effective in treating her disorder.