A recent study showed that employees who regularly participate in the company's wellness program report higher job satisfaction. Therefore, the wellness program effectively boosts employee morale. Which of the following, if true, most strengthens the argument?

✓ Correct Answer: Option B

This option eliminates a potential alternative explanation (that already satisfied employees join the program). By showing that discontinuing the program removes the benefit, it strengthens the causal link between the program itself and job satisfaction.