Typically, the larger an engine is in a vehicle, the more fuel it will consume. Steven gathers data on vehicles and records their engine size and their city gas mileage. What are Steven's explanatory and response variables, and what type of association will he likely see? (A) gas mileage is a response variable, and you expect to find a negative association. (B) gas mileage is a response variable, and you expect to find a positive association. (C) gas mileage is an explanatory variable, and you expect to find a strong negative association. (D) gas mileage is an explanatory variable, and you expect to find a strong positive association.