The model that would be the best fit for bivariate data set using the given coefficients o determination is Exponential Model.
Joel is trying to find the best model for a bivariate data but Bivariate data is simply referring to two variables.
The correlation coefficient or coeeficient of determination is a measure of goodness of fit of bivariate data to a model which is usually linear. However, in this question we are looking at a linear model, a quadratic model, and an exponential model.
Now, the model with the highesr value of coefficient of Determination is usualy the one with the best fit.
Hence, the exponential model has the largest Coefficient of Determination value and is the best fit.