Given a text T, and several options, according to the question posed in the text T to choose the most appropriate option from the options as the answer, please directly output the most appropriate option, do not need to output the explanation.

A correlation of 0.34 between two variables, X and Y, is best described as:
Option A:changes in X causing changes in Y.
Option B:a positive association between X and Y.
Option C:a curvilinear relationship between X and Y.

Answer: B