Main Answer:
The event that controls this loop is option A) Call the next customer.
Therefore, the correct answer is A) Call the next customer.
Step-by-step explanation:
In the given set of instructions for a bank teller, the loop is governed by the action of calling the next customer, as indicated by option A. This event acts as the condition for the continuation of the loop; as long as there are more customers waiting in line, the loop persists, and the teller proceeds to call the next customer.
The other options (B, C, and D) represent actions that may or may not be taken within the loop, depending on specific conditions, but they do not control the loop itself. The loop remains active until there are no more customers to be served, at which point it is concluded by ending the loop.
This design ensures that the teller systematically attends to each customer in line, progressing through the loop until the queue is empty. The logic is straightforward: if there are more customers waiting, keep calling the next customer. Once the last customer is served, the loop naturally ends. This structure streamlines the customer service process, maintaining efficiency in handling transactions and loan inquiries.
In summary, the pivotal event controlling the loop is the act of calling the next customer, providing a clear and concise structure for the bank teller's workflow.
Therefore, the correct answer is A) Call the next customer.