Synonym of STAMINA

Answer: Option A

Endurance : the ability to endure an unpleasant or difficult process or situation without giving way.
Intensity : the quality of being intense.
Eagerness : enthusiasm to do or to have something; keenness.
Energy : the strength and vitality required for sustained physical or mental activity.
Stamina : the ability to sustain prolonged physical or mental effort.

Synonym of Stamina is Endurance