Option 1 -> Leisurely means slow and relaxed, which is opposite to the energetic nature of "vivacious."
Option 2 -> Vibrant means full of energy and enthusiasm, which perfectly captures the lively and spirited meaning of "vivacious."
Option 3 -> Audacious means bold or daring, which relates to courage rather than liveliness.
Option 4 -> Nonchalant means casual and unconcerned, which contrasts with the animated quality of "vivacious."
Hence, Option 2: Vibrant -> "Vivacious" describes someone or something full of life, energy, and high spirits. In the context of a performance, this would be lively, animated, and energetic - qualities best captured by the word "vibrant" which conveys the same sense of dynamic energy and enthusiasm -> correct