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The passage presents a balanced assessment: SAF blends work technically (“without engine modifications”) and reduce emissions modestly, but current supply and cost barriers limit universal deployment. The suggested path is strategic: prioritize high-traffic routes (max climate impact per gallon) and grow feedstock partnerships in ways that avoid land-use conflicts (“doesn’t compete with food”). This synthesis is captured by B. Option A overclaims; nothing indicates elimination of all emissions. Option C ignores the practical successes and the proposed scaling approach. Option D denies a constraint the passage explicitly flags (food–fuel competition). On Nelson–Denny main-idea tasks, integrate capability (works now), constraint (supply/cost), and policy recommendation (targeted rollout + sustainable scaling). The correct choice mirrors that three-part structure, avoiding extremes. Recognizing this pattern helps with other technology passages where early feasibility pairs with infrastructural or ethical constraints that demand careful sequencing rather than blanket adoption or rejection.