medium · GMAT Verbal
An airline began offering free high-speed Wi-Fi on all domestic flights. Within six months, its customer satisfaction scores for 'In-Flight Entertainment' rose by 40%. The airline concluded that the addition of Wi-Fi was the cause of the score improvement.
Which of the following, if true, most strengthens the conclusion?
- A competitor airline started charging passengers for the in-flight Wi-Fi that it had previously offered free of charge.
- The airline also upgraded the seating throughout its economy cabin to provide noticeably more legroom on every domestic flight.
- Surveys showed that passengers were far more likely to recommend the airline to their friends and colleagues after the change.
- The airline's marketing campaign that season focused heavily on advertising the availability of fast, free in-flight Wi-Fi.
- Satisfaction scores for other entertainment options, such as movies and music, remained unchanged during the same period.
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