In Brindon County, virtually all of the fasteners-such as nuts, bolts, and screws-used by workshops and manufacturing firms have for several years been supplied by the Brindon Bolt Barn, a specialist wholesaler. In recent months many of Brindon County' s workshops and manufacturing firms have closed down, and no new ones have opened. Ttherefore, the Brindon Bolt Barn will undoubtedly show a sharp decline in sales volume and revenue for this year as compared to last year. The argument depends on assuming which of the following?
A: The workshops and manufacturing firms that have remained open have a smaller volume of work to do this year than they did last year.
B: Last year the Brindon Bolt Barn's sales volume and revenue were significantly higher than they had been the previous year.
C: The Brindon Bolt Barn is not a company that gets the great majority of its business from customers outside Brindon County.
D: Soon the Brindon Bolt Barn will no longer be the only significant supplier of fasteners to Brindon County's workshops.
Choose A, B, C or D as your solution.
C