Her vivacity attracted everybody.

Answer: Option C

Vivacity : (especially in a woman) the quality of being attractively lively and animated.
Beauty : a combination of qualities, such as shape, colour, or form, that pleases the aesthetic senses, especially the sight.
Humour : the quality of being amusing or comic, especially as expressed in literature or speech.
Apathy : lack of interest, enthusiasm, or concern.
Truthfulness : the fact of being true; truth.

Antonym of Vivacity is Apathy