At Agency Z, a supervisor recently transferred from Team A to Team B. Since the move, Team B's productivity numbers increased six weeks in a row. The Office Director concluded that the supervisor's reassignment to Team B is a direct cause of the increased productivity. Which of the following statements, if true, would most strengthen the above conclusion? Several members of Team A have left the Agency since the supervisor transferred. Team B's productivity was unusually low during the two-week period before the new supervisor arrived. Due to the nature of Team B's work, it takes at least six weeks for any new policies or procedures to have an impact on the team's productivity numbers. Team B's new supervisor has previously led several other teams to increased productivity. Team B has increased its staff by 50 percent since the new supervisor arrived