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 straight line of regression;and/or 3) the standard deviations of these normal distributions are equal?

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