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The sentence contrasts early positive impressions (“impressed reviewers”) with later, practical concerns (“maintenance issues”) discovered in field trials. The conjunction “While” signals concession: despite initial praise, problems remain. Therefore, the reasonable inference is that further improvements are required before launching—option C. Option A contradicts “must be solved before launch”; B ignores the explicit “impressed”; D contradicts the existence of issues. On PERT Reading, inference questions often rely on contrast markers to frame a nuanced position. Recognize that evaluations can evolve as testing conditions change: polished demos may hide problems that rigorous trials reveal. Translating that into a concise inference—“not ready yet; fix maintenance issues first”—demonstrates you can connect evidence to implications without overreaching. This skill is valuable when reading abstracts, product reports, or policy briefs in college courses: identify the current status (promising), the blockers (maintenance), and the next step (solve issues), then select the option that reflects that sequence.