Final answer:
The increase in the amount of food prepared for cafeteria service is the cause of Jennifer's labor budget overages.
Step-by-step explanation:
The cause of Jennifer's labor budget overages is the increase in the amount of food prepared for cafeteria service. The production staff reported a 25% increase in the amount of food prepared for cafeteria service, which led to increased labor costs in the cafeteria department.
To determine if this is the correct cause, Jennifer can compare the actual labor expenses for the cafeteria department in June with the labor expenses from previous months or the same month in previous years. To confirm this, Jennifer should analyze labor hours and workload before and after the new menu introduction, review overtime records, and compare the number of meals served with the increase in labor cost.