If a passenger is experiencing heart palpitations, what is the appropriate action?

When a passenger is experiencing heart palpitations, having them lie down and rest is an appropriate action because lying down can help alleviate symptoms and reduce the heart's workload. This position can also prevent fainting or dizziness that may accompany palpitations. Resting allows the person's heart to stabilize and may provide a sense of calm, which could further help in reducing the frequency and intensity of the palpitations.

Encouraging the passenger to drink water, providing sugary snacks, or performing CPR may not directly address the situation at hand. While staying hydrated is generally good advice, it may not be the best initial response to heart palpitations specifically. Sugary snacks might be relevant in scenarios involving low blood sugar, but they are not appropriate for defining heart issues like palpitations. As for CPR, it is reserved for unconscious patients who are not breathing or do not have a pulse, which is not indicated in the case of someone simply experiencing palpitations. Therefore, guiding the passenger to lie down and rest is the most suitable action.