Which of the following statements is not a reason why iron rails were the best choice for the first steam-powered transport

You forgot your options, but I think i've seen this question somewhere already and i remember them. The answer is that it is not true that Iron could be manufactured without the need to heat it up. 

Currently, as of february 2016, an american traveling in france would be by the exchange rate. the weakness of the euro and the strength of the us dollar means that items in france cost less to an american than they otherwise would. of course, if this trend reverses and the us dollar weakens and the euro strengthens, such as was happening in early 2008, an american traveling in france would have an adverse experience because items would cost relatively more.

Answer/// absolute and unchanging laws;