Answer:
c.concerned with the income-generating activities of a firm.
Step-by-step explanation:
An operating budget -
It refers to the activity of forecasting the expenses and revenues of the future , is known as operating budget .
An operating budget is prepared prior an year in order to show all the expected activities for the complete year in a concise manner .
It also enables to give the complete information of the resources including the reimbursable work or services .
Hence , from the given information of the question ,
The correct answer is c.