Potential remedies for when your model suffers from the endogeneity problem include all of the following except what?
A. Gather (additional) longitudinal data to allow for a fixed effect approach.
B. Gather (additional) control variables that would limit the endogeneity concern.
C. Gather (additional) data on a possible instrumental variable.
D. Check if the residuals from your regression are uncorrelated with your treatment.
Answer: D
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