Mortgage banker: There is a remarkable correlation between fluctuations in the federal interest rates and the strength of our nation' s currency. Undoubtedly, despite the opinions of the majority of economists, the federal interest rates effectively control the strength of our nation' s currency. Economist: I beg to differ. Any experienced economist will testify that in regards to something as complex as our nation' s economic status, no consequential component is shaped or controlled by any one factor. The renunciation by the economist of the banker's conclusion utilizes which one of the following techniques of argumentation? ['offering a detailed counterexample that illustrates that a conclusion is incorrect', 'challenging a conclusion regarding an explicit statement by appealing to an applicable principle', 'forcing an opponent to elaborate on his facts in order to reveal a discrepancy', "drawing an analogy to show the similarities between his opponent's argument and the economist's own conclusion"]