Answer:
C. The purchasing manager's behavior should be expected to increase Southern's riskiness by increasing its exposure to potential supply shortages of mistimed deliveries.
Explanation:
The purchasing manager would maybe right in trusting his known suppliers, but there is a risk involved there i-e, when the company would want to procure more, then purchasing manager's small group of suppliers may don't have more material to supply because Southern Supply isn't the only company they are dealing with.