Which statement best illustrates a correlation between two variables

A)  Scores on one variable are related to scores on the second variable. 
B)  Scores on either variable cause scores on the other variable. 
C)  Scores on one variable are different from the scores on the second variable. 
D)  Scores on one variable are independent from the scores on the second variable.

A correlation indicates a relationship or association between two variables, where changes in one variable are associated with changes in the other variable. Option A specifically mentions that the scores on one variable are related to scores on the second variable, correctly describing a correlation. Option B suggests a causal relationship, which is not indicative of a correlation, whereas options C and D suggest differences or independence between the variables, which does not demonstrate a correlation.