Rent, salaries, ads - all tangled in the web of "business expenses"! This umbrella covers your purchasing, operating, selling woes. One term, endless costs.
All three options - purchasing, operating, and selling expenses - are certainly types of business expenses. They represent specific categories within the broader umbrella of costs incurred while running a business.
So, while each option describes a different aspect of business expenditures, the most comprehensive answer that encompasses them all is:
D) Business expenses
It encapsulates the entire spectrum of monthly costs a business faces, from acquiring materials to keeping the lights on to generating sales. Think of it as a one-stop shop for all your "costly needs!"