Why Is It Important to Control Extraneous Variables (To the Best

Multiple Choice

Why is it important to control extraneous variables (to the best extent possible) ?

A) An uncontrolled extraneous variable (variable "X") can cause doubt as to whether changes in one variable (variable "A") cause changes in another variable (variable "B")
B) An uncontrolled extraneous variable (variable "X") can act as an alternative explanation for the claim that changes in one variable (variable "A") cause changes in another variable (variable "B")
C) Uncontrolled extraneous variables rarely have an impact on empirical research and therefore it is not important to carefully control them most of the time
D) Both a and b are correct