Identify the explanatory variable and the response variable. the number of hours a child spends practicing the piano each week for six months and the number of mistakes he makes in a concerto The explanatory variables represents --Select- variable is --Select-- ; the response ) the number of hours a child spends practicing the piano each week for six months O the number of mistakes a child makes in a concerto or he first sentence ) the number of hours he spends practicing the piano each week for six months O the number of mistakes he makes in a concerto