An Omitted Variable Is a Variable That ________

Multiple Choice

An omitted variable is a variable that ________.

A) is purposely left out as it does not aid an economic analysis
B) does not cause other variables in a study to change when it changes
C) is removed from a study as it can lead to the problem of reverse causality
D) has been left out, and if included, would explain why the variables considered in a study are correlated