Read the given passage and answer the question that follows.
India’s earthen lamp makers are losing domestic sales because of lower-priced imports of cheap fancy electric lamps, which is because foreign government employs forced labour to work without any labour charges. Whatever the reason be, the cost is the means of livelihood of the domestic lamp makers and sellers. Therefore, it would not only support and protect domestic lamp makers, but also other industries sales, if our government took measures to reduce cheap material imports.
Which of the following, if true, most seriously weakens the above argument?