Question

omar asensio and colleagues examined consumer reviews of 12,720 electric - vehicle charging stations in the us, classifying each review as positive or negative. they found that, among publicly owned or managed charging stations, the proportion of negative reviews in illinois was slightly higher for paid stations (those requiring a fee to use) than it was for free stations, and the proportion of negative reviews in hawaii was substantially higher for paid stations than it was for free stations. assuming that the paid and free stations provide roughly equivalent levels of service, these results suggest that ____
which choice most logically completes the text?
a the fees for using paid publicly owned or managed stations are higher in illinois than in hawaii.
b free stations are less common in illinois than they are in hawaii.
c electric - vehicle owners do not typically know whether a given station is publicly owned or managed.
d users of paid stations have higher expectations of the quality of the stations than do users of free stations.

Explanation:

• Option A: The text compares negative review proportions between paid and free stations in Illinois and Hawaii, not fees between the two states. So this option is irrelevant.
• Option B: The text is about negative review proportions of paid vs free stations, not the commonness of free stations in different states.
• Option C: The text does not mention anything about electric - vehicle owners' knowledge of station ownership.
• Option D: Since paid stations (in both Illinois and Hawaii) have higher proportions of negative reviews (assuming similar service levels), it can be inferred that users of paid stations have higher expectations (so when those expectations aren't met, more negative reviews). This option logically completes the text.

Answer:

D. users of paid stations have higher expectations of the quality of the stations than do users of free stations.