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Apply the negation test. Negate B: online publishing costs the same as printing, or more. Then the move cannot cut costs and the stated ground for the decision is gone — so B is an assumption. Negate A: readers prefer print. Costs still fall; the publisher may lose readers, but the cost argument survives, so A is not an assumption. C is a hoped-for benefit the argument never claims. D would explain the publisher’s motive, and a motive is not a premise: even if printing costs had been flat for a decade, the decision would still cut costs so long as B holds.