The industrial city of Silverton is going through a recession, and within a year, all small domestically-owned steel mills in the city are expected to go out of business permanently due to competition with Globo-Steel, a large domestically-owned steel mill that opened in a neighboring city last year. However, these mills will surely re-open shortly after they close; since the foreign-owned steel company Gigante Gruppo came to Silverton last year, every mill that has closed temporarily due to competition with Gigante Gruppo has re-opened, usually with the same ownership, within a month.

Which of the following, if true, is most likely to undermine the conclusion of this argument?

(A) Several major clients of Gigante Gruppo have recently switched to Globo-Steel due to trade laws that give tax breaks to clients of domestic heavy industry.
(B) Many steel mills in Silverton create galvanized steel that doesn't rust, a popular variety of steel that is not sold by either Gigante Gruppo or Globo-Steel.
(C) Silverton has more steel mills operational today than it has ever had in the past.
(D) Over the next year, Silverton is planning to create several large municipal projects, including two suspension bridges and a new football stadium, which will require large amounts of steel.
(E) The vast majority of the steel mills that have closed because of competition with Gigante Gruppo and then re-opened are domestically-owned.

[color=black]Answer: E, I can't really understand the key concept of this question.[/color]