Manufacturing plants in Arundia have recently been acquired in substantial numbers by investors from abroad. Arundian politicians are proposing legislative action to stop such investment, justifying the proposal by arguing that foreign investors, opportunistically exploiting a recent fall in the value of the Arundian currency, were able to buy Arundian assets at less than their true value. Which of the following, if true, casts the most serious doubt on the adequacy of the Arundian politicians' justification for the proposed legislation? ['Foreign investors who acquired Arundian manufacturing plants generally did so with no intention of keeping and running those plants over the long term.', 'In Concordia, a country broadly similar to Arundia, the share of manufacturing assets that is foreign- controlled is 60 percent higher than it is in Arundia.', 'The true value of an investment is determined by the value of the profits from it, and the low value of the Arundian currency has depressed the value of any profits earned by foreign investors from Arundian assets.', 'The Arundian government originally welcomed the fall in the value of the Arundian currency because the fall made Arundian exports more competitive on international markets.']