Which of the Following Are True Assumptions Underlying Linear Regression

Multiple Choice

Which of the following are true assumptions underlying linear regression? 1) For each value of X, there is a group of Y values which is normally distributed. 2) The means of these normal distributions of Y values all lie on the regression line. 3) The standard deviations of these normal distributions are equal.

A) Only (1)
B) Only (2)
C) Only (3)
D) All of them