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GRE Argument tasks emphasize identifying unstated assumptions that link evidence to conclusion. The company’s reasoning is: free delivery → more orders → higher profits. To reach “higher profits,” the net financial effect must be positive. That requires the incremental revenue (from additional orders and any changes in basket size) to exceed incremental delivery costs; otherwise, volume could increase while profits fall. Option D articulates this bridge. Option A is irrelevant—delivery policy, not prep time, is the lever. Option B, while potentially important competitively, is not strictly necessary for the argument to hold; even if competitors match, profits might still rise if the company’s economics are favorable. Option C need not be true; profits could increase even if average order size changes, provided the net margin covers delivery costs. When evaluating assumptions, ask: if the choice were false, would the conclusion be undermined? If D were false (i.e., costs exceed added revenue), profits would not rise, collapsing the claim—hence it is necessary.