All of the Following Are True, with the Exception of One

Multiple Choice

All of the following are true, with the exception of one condition:

A) a high R² or $\bar { R } ^ { 2 }$ does not mean that the regressors are a true cause of the dependent variable.
B) a high R² or $\bar { R } ^ { 2 }$ does not mean that there is no omitted variable bias.
C) a high R² or $\bar { R } ^ { 2 }$ always means that an added variable is statistically significant.
D) a high R² or $\bar { R } ^ { 2 }$ does not necessarily mean that you have the most appropriate set of regressors.