Answer: A) Resources
Explanation: Resources is defined as the element or value(e.g.- staff workers, money, assets etc) that are used in the process or event to gain effective and efficient results. It works according to the requirement of the any field to provide satisfaction.
Employees,equipment, functions that are being used in the organization are considered as resources because they are fulfilling the demand of the greeting card organization. Working and processing is done through tools and workers to manufacture the greeting cards .
Other options are incorrect because reserves are values that are regained to be used in future.Overhead is regarded as the expense that is required for business processing .Variable cost changes along with the output stage. Thus the correct option is option(A).