A scrap metal recycling plant processes the excess metals for three neighboring cities. Companies from the cities deliver their scrap metal to the plant at the beginning of the month, and pick up the processed metal for reuse at the end of the month, paying the plant a fixed rate per ton of metal processed. The monthly income that the plant receives is always sufficient to pay the plant's operating costs, but is inconsistent, especially in economic downturns, when the decrease in manufacturing in neighboring cities decreases the amount of scrap metal companies bring to the plant each month.
Which of the following plans, if instituted, would have the best chance of making the scrap metal plant's monthly income both sufficient to cover the plant's operating costs and consistent?
(A) Merge with another scrap metal recycling plant that provides similar services, so that the two plants can handle twice as many tons of scrap metal per month as the single plant currently does.
(B) Expand the plant's operational base to recycle metals used in construction, a field that tends to suffer during economic downturns.
(C) Replace the fixed rate per ton of metal processed with a uniform monthly fee based on the number of tons of scrap metal companies would typically expect the plant to process.
(D) Increase the fixed rate per ton of scrap metal processed to a level at which the plant can ensure an income stream that covers its operating costs, even during an economic downturn.
(E) Offer the plant's scrap metal processing services to additional neighboring cities, so that a significantly larger number of companies can bring their scrap metal at the current fixed rate per ton of scrap metal processed.