An argument claims that 'Implementing a four-day work week will increase employee productivity.' Which of the following, if true, would MOST strengthen this claim?

The correct answer to the question "An argument claims that 'Implementing a four-day work week will increase employee productivity.' Which of the following, if true, would MOST strengthen this claim?" is Option C: A controlled study shows a direct correlation between reduced work hours and higher output per hour..

The other options — A) A similar company in a different industry saw increased profits after reducing work hours., B) Employees in a pilot program reported feeling less stressed with a four-day work week., D) The company's main competitor also plans to adopt a four-day work week. — are incorrect for this GMAT Exam Prep question. As explained above: A controlled study provides direct, specific, and empirical evidence linking reduced work hours to increased productivity per hour, which directly supports the argument's claim more strongly than oth…