If f is an explanatory variable and g is the corresponding response variable, which of these would be represented by the vertical axis on a scatterplot?

A. Neither f nor g

B. f

C. Both f and g

D. g

Explanatory variable (it explains or predicts the response) is the independet variable, so it is represented in the horizontal axis.

Response variable (it responds to the explanatory variable) is the dependent variable, so it is represented on the vertical axis.

Then, the answer is g (the response variable).