The indignation of the retreating troops resulted in large scale killings.

Answer: Option B

Indignation : anger or annoyance provoked by what is perceived as unfair treatment.
Displeasure : a feeling of annoyance or disapproval.
Happiness : the state of being happy.
Orderliness : the quality of being well arranged or organized.
Anger : a strong feeling of annoyance, displeasure, or hostility.

Antonym of Indignation is Happiness