Executives at a large multinational corporation want to be able to predict the average revenue per month for the whole corporation for a given number of types of product sold. Data on revenue (in $1,000,000s) and types of product sold were collected for a sample of months. Complete parts a through c below a) Which variable is the explanatory or predictor variable? A. The explanatory variable is revenue per month because the executives want to know how revenue per month depends on types of product sold B. The explanatory variable is revenue per month because the executives want to know how types of product sold depends on revenue per month. C. The explanatory variable is types of product sold because the executives want to know how types of product sold depends on revenue per month D. The explanatory variable is types of product sold because the executives want to know how revenue per month depends on types of product sold