Critical Reasoning

In Turinan, steel manufacturers are suffering declining sales as a result of foreign steel imports that are cheaper than domestic steel. Many of these foreign imports are less expensive because the governments of the countries from which they originate subsidize their steel industries, in violation of international accord. Regardless, jobs in the steel industry in Turinan are going to disappear thanks to this foreign competition unless something is done to counteract it. Therefore, to protect the steel industry in Turinan, as well as employment in other industrial sectors, the government of Turinan should levy heavy tariffs against foreign steel imports.
Which of the following, if true, most seriously weakens the above argument?
A. Steel produced in Turinan is rarely competitive on the world market, partially as a result of the fact that the steel industry in Turinan is not subsidized by the government.
B. No clear penalties for violating the international ban on government subsidization of steel manufacture have been specified to date.
C. Many non-steel manufacturers in Turinan must contend with heavy competition, both at home and on the world market, and steel represents a large proportion of their materials costs.
D. Government subsidies are not the only factor contributing to the availability of lower-cost foreign steel products that are currently threatening the steel industry of Turinan.
E. Steelworkers in Turinan, on average, earn higher wages than do steelworkers in many of the countries from which the referenced foreign steel imports originate.