Strangers will be more likely to answer your personal questions if you type them up on your university's letterhead stationery than if you simply ask them verbally. This illustrates that people are more obedient when

Question

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The statement suggests that people are more likely to comply with a request when they perceive institutional authority is behind it, which is evidenced by the use of university letterhead stationery. The other choices are not directly relevant to the scenario described.

Strangers Will Be More Likely to Answer Your Personal Questions