In a Study of the Relationship Between Weight and Height,a

In a study of the relationship between weight and height,a sample regression equation is obtained,in which height is used as the predictor variable.This sample regression equation is then used to make inferences.Which of the following statements is true?

A) A 95% confidence interval for the mean weight of all subjects of height 165 cm will be the same width as a 95% prediction interval for the weight of an individual of height 165 cm.
B) A 95% confidence interval for the mean weight of all subjects of height 165 cm will be narrower than a 95% prediction interval for the weight of an individual of height 165 cm.
C) A 95% confidence interval for the mean weight of all subjects of height 165 cm will be wider than a 95% prediction interval for the weight of an individual of height 165 cm.