An argument states: 'Our new policy to allow employees to work remotely two days a week has led to a 10% increase in productivity. This policy should be adopted company-wide.' To properly evaluate whether the increased productivity is *due to* the remote work policy, what additional information would be most helpful?
✓ Correct Answer: Option D
A control group (departments without the policy) would help isolate the effect of remote work, ruling out other potential causes for the productivity increase, thereby strengthening or weakening causation.