A botanist found a correlation between the length of an aspen leaf and its surface area to be 0.94. Why does the correlation value of 0.94 not necessarily indicate that a linear model is the most appropriate model for the relationship between length of an aspen leaf and its surface area? A) The value must be exactly 1 or -1 to indicate a linear model is the most appropriate model.

B) The value must be 0 to indicate a linear model is the most appropriate model.

C) A causal relationship should be established first before determining the most appropriate model.

D) The value of 0.94 implies that only 88% of the data have a linear relationship.

E) Even with a correlation value of 0.94, it is possible that the relationship could still be better represented by a nonlinear model.