The answer is letter d, financial resources. It is a period covering all financial funds of the organization. From an economic perspective financial resources are the part of the organization’s assets or property). Sometimes these are referred just as finance, often with some attributes (like Business finance, Personal finance, Public finance). Finance is one type of source, correspondingly, that inputs into the production process. Also, according to open systems the inputs are external factors such as raw materials, human resources, information, financial resources, and equipment.