ExplanationUnderstand the passage first.
-The replacement value (when lost) of Nebula G10 < replacement value of Outlook M1.
-But repair cost under warranty for accidental damage is higher for Nebula G10 than Outlook M1.
Reason given: Nebula G10 repairs are especially labor-intensive, and labor is a significant cost factor. So the explanation assumes the higher repair cost for Nebula G10 despite its lower replacement value is because labor is high for G10 repairs. We are asked to strengthen that explanation.
A Talks about frequency of accidents, not about why repair cost for G10 is higher. Could relate indirectly to labor demand but doesn’t directly support the labor-cost explanation.
B. “Outlook M1 phones are considered more economically valuable largely for ease of repair.” This directly contrasts the two: If Outlook M1 is easier to repair, then harder-to-repair Nebula G10 would naturally have higher labor costs. This explains why replacement value (market value) might be lower for G10 (maybe due to lesser materials/features), but in repairs the labor intensity pushes G10’s repair cost above M1’s.
C. Higher availability of Nebula G10 repair specialists would likely reduce labor cost (more supply means lower price), which would undermine, not support, higher repair cost.
D. Irrelevant. Routine upkeep cost difference irrelevant to accident repair costs under warranty.
E. Return for defects rate greater ---> maybe warranty repairs for defects, but the argument is about accidental damage repair costs under warranty, not defect returns.
Answer: B