Final answer:
The correct answer is option d. All of the items are part of an investment center.
Step-by-step explanation:
The manager of an investment center is responsible for a broad range of activities that encompass cost control, profitability, and investment decisions. This type of center is a unit within a business that is measured against its use of capital and its ability to generate returns. As such, investment center managers are not only tasked with managing costs and maximizing profits but also with making strategic decisions about investments in assets that will drive their center's financial performance.
In regard to the question posed by the student, the correct answer is d. All of the items are part of an investment center. This because an investment center's performance is evaluated on the profitability it generates relative to the investments made. Therefore, a manager's role includes careful consideration of costs, revenue generation, and strategic investments to ensure the center's success.