Which word describes a trip to Hawaii that a vacationer felt was too short?

The correct answer is C: 'Ephemeral.' Ephemeral means lasting for a very short time, which accurately describes a trip that felt too short. In this context, 'ponderous' means slow and clumsy, 'salacious' means lustful or obscene, and 'erudite' means scholarly or knowledgeable. These choices do not convey the idea of a short trip that the vacationer felt was too brief. Therefore, 'Ephemeral' is the most suitable choice to describe a trip perceived as too short by the vacationer.