A tech company noticed that employees who take a 15-minute walk every afternoon are 20% more productive than those who stay at their desks. The management concluded that physical movement directly boosts workplace productivity.
Which of the following options, if true, most strengthens the management's conclusion?

Answer: B. A study at a different company showed that afternoon breaks without movement do not increase productivity.

• The argument claims that physical movement is the cause of the productivity boost.
• Option B rules out an alternative explanation: it proves that simply taking a break isn't what causes the boost; it must be the movement itself. This directly supports the causal link.
• Option C actually weakens the argument by suggesting a reverse cause (they walk because they are already productive/efficient).

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