What does vitality refer to?

Vitality refers to the quality of being full of life and energy, encompassing a sense of liveliness and vigor. It describes an energetic state where one feels robust and spirited, often linked to physical and mental health. This term can apply to living organisms, particularly in contexts where enthusiasm, zest, and a proactive approach to life are highlighted.

In contrast to the other options, which suggest negativity or calmness that lacks energy, vitality encapsulates a dynamic and vibrant essence. Thus, identifying vitality with energy and liveliness accurately captures the word's meaning, making it the correct response.