Based on what you know about dental hygiene and health which of the following would be the best description of the correlation between variable A (the number of times a day one brushes their teeth) and variable B (the number of cavities one has when they go to the dentist).
a. a strong negative correlation.
b. a weak positive correlation.
c. a strong positive correlation.
d. zero correlation.
e. a weak negative correlation

Option A

Explanation:

In a negative co-relation between two variable, if one variables increase the other variable decrease. While in a positive correlation between two variables, if one if one variable increase the other variable also increase.

We know that the larger the number of times a person brushes his/her teeth, the lesser is the cavity when he /she goes to the dentist.  

Thus variable A and B have a a strong negative correlation

Option A is correct