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The contrast marker “However” sets up a shift from initial positivity—“impressive” demo—to a cautionary finding—“durability issues” in field tests. This structure supports option C: early promise was tempered by later evidence. Option A contradicts the need to address issues pre-launch. Option B overreaches; the sentence mentions field tests, not lab failure across the board. Option D is the opposite of what’s stated; the demo did not prove long-term reliability. On PERT Reading, recognizing contrast and concession markers (“however,” “although,” “despite”) is crucial to tracking an author’s evolving evaluation. The skill involves weighting evidence: public demos often showcase form and features, while field tests probe endurance and performance. Summarizing that nuanced stance prepares you to handle critical reviews of studies, products, or policies in college work where initial claims meet rigorous validation.