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The argument presumes that removing access in schools reduces total caloric intake of sugary beverages for students. For that to translate into lower obesity rates, students must not “make up” the missing sugar by buying sodas after school or substituting high-calorie snacks. Option B articulates this displacement (or “compensatory behavior”) assumption. If it is false, the intervention may have negligible net impact on obesity despite reducing on-campus purchases. Option A (parental support) affects implementation politics, not the causal mechanism. Option C is logistical/financial, not logically necessary for the health effect. Option D introduces an unrelated variable that might influence obesity but isn’t assumed in the argument’s chain. On GRE assumptions, identify where the proposed intervention could be offset by behavior change; the necessity is with preventing substitution that nullifies the intended effect.