Buddy's Bolt Barn supplies fasteners—nuts, bolts, and screws—to local workshops and manufacturers. In fact, Buddy's supplies virtually all of the fasteners that manufacturers and workshops in this region use. In recent months several local manufacturers that had been customers of Buddy's dosed down, and no new ones have opened. Therefore, Buddy's sales volume and revenue for the year will be lower than in past years.
Which of the following, if true, most seriously weakens the argument?
A) The manufacturers that closed did so because other local manufacturers had expanded and taken over their trade.
B) An assembly plant for which local workshops and manufacturers did a great deal of work has reduced the scale of its operations in the last year.
C) Some local manufacturers are trying to achieve cost savings by starting to purchase the fasteners they need from a national wholesaler.
D) So as to be able to meet the needs of its customers at short notice, Buddy's carries a very large inventory.
E) Buddy's has essentially no customers other than local workshops and manufacturers.