The Two Critical Elements Required to Sign the Bias of an Omitted

Multiple Choice

The two critical elements required to sign the bias of an omitted variable include the sign of the:

A) effect of the omitted variable on the outcome and the sign of the effect of the treatment variable on the outcome.
B) effect of the omitted variable on the outcome and the sign of the correlation between the omitted variable and the outcome.
C) effect of the omitted variable on the outcome and the sign of the correlation between the omitted variable and the treatment.
D) correlation between the omitted variable and the outcome and the sign of the correlation between the treatment variable and the outcome.