A grоcery stоre mаnаger recоrds the number of fаmily members in a household and the number of times the household eats out per week. They believe these may influence weekly household grocery spending. Identify each variable as either an explanatory or a response variable. The number of family members in a household is [a] variable. The number of times the household eats out per week is a [b] variable. Weekly household grocery spending is a [c] variable.