Elephants, when they go wild, ought to be killed.

Answer: Option A

Wild : (of an animal or plant) living or growing in the natural environment; not domesticated or cultivated.
Tame : (of an animal) not dangerous or frightened of people; domesticated.
Meek : quiet, gentle, and easily imposed on; submissive.
Mild : not severe, serious, or harsh.
Domestic : relating to the running of a home or to family relations.

Antonym of Wild is Tame