OE
The sentence states that two things were thought to be equally unlikely in 1986. But today, while one of those events still seems quite farfetched, the other is commonplace, making the argument sound absurd or “preposterous.” “Preternatural” means what is beyond normal or natural and is used to express mysterious or exceptional events. This argument isn’t really mysterious as much as it is wrong. Note that “prescient” (ability to foretell the future) is the opposite of what the sentence requires—because the prediction about the future was entirely wrong, it does not sound “prescient.” To “preordain” is to decide or determine an outcome in advance. While the fact that banking transactions from home are commonplace now could possibly imply that the transactions were “preordained,” the argument against such a possibility would neither be preordained nor sound preordained. Finally, “pithy” means concise, and nothing in the sentence suggests that the argument is concise.
Answer: D