It is primarily by raising interest rates that central bankers curb inflation, but an increase in interest rates takes up to two years to affect inflation. Accordingly, central bankers usually try to raise interest rates before inflation becomes excessive, at which time inflation is not yet readily apparent either. But unless inflation is readily apparent, interest rate hikes generally will be perceived as needlessly restraining a growing economy. Thus, central bankers' success in temporarily restraining inflation may make it harder for them to ward off future inflation without incurring the public' s wrath. Which one of the following most accurately describes the role played in the argument by the claim that it is primarily by raising interest rates that central bankers curb inflation? ["It is a premise offered in support of the conclusion that central bankers' success in temporarily restraining inflation may make it harder for them to ward off future inflation without incurring the public's wrath.", "It is presented as a complete explanation of the fact that central bankers' success in temporarily restraining inflation may make it harder for them to ward off future inflation without incurring the public's wrath.", 'It is a premise offered in support of the conclusion that unless inflation is readily apparent, interest rate hikes generally will be perceived as needlessly restraining a growing economy.', 'It is a description of a phenomenon for which the claim that an increase in interest rates takes up to two years to affect inflation is offered as an explanation.']