According to the best-fitting wt = smoke + other stuff model, what does -9.76 represent? Responses A The mean difference in weight for newborns born to mothers who smoke versus mothers who do not smoke.The mean difference in weight for newborns born to mothers who smoke versus mothers who do not smoke. B The mean weight of newborns.The mean weight of newborns. C The mean weight of newborns born to a mother who smokes.The mean weight of newborns born to a mother who smokes. D The mean weight of newborns born to a mother who does not smoke