We build the following regression model BIRTH WEIGHT = Bo + B, WHITE + E where BIRTH WEIGHT is in grams and WHITE is 1 for white mothers and 0 for black mothers. Suppose B1 = 357 g. Interpret this statistic. (a) The average birth weight of babies born to black or white mothers is estimated to be 357 g. (b) The average birth weight of babies born to white mothers is estimated to be 357 g. (c) The average birth weight of babies born to black mothers is estimated to be 357 g. (d) On average the difference in birth weight between babies born to white mothers and babies born to black mothers is estimated to be 357 g