Which of These Statements Best Describes the Requirements of Independent

Multiple Choice

Which of these statements best describes the requirements of independent variables in multiple regression?

A) All X variables must be strongly correlated with each other.
B) At least one X variable will have linear associations with Y; the Y variable is nominal or ordinal.
C) All X variables have additive and linear association with Y.
D) There can be no more than four X variables; there can be only low correlation between them.