Correct option is C
Option (c) is the correct antonym of the given word.
Cruel: Willfully causing pain, suffering, or distress to others; lacking in compassion or kindness.
Synonyms: Ruthless, heartless, brutal, inhumane, sadistic.
Antonyms: Kind, compassionate, humane, merciful, gentle.
Meanings of all options-
Trunk - The main stem of a tree, typically supporting branches and leaves, or a large, sturdy box for storing items.
Brutal - Extremely harsh or cruel in actions, often involving violence or excessive force.
Kind - Having a gentle, caring, and benevolent nature; showing compassion and generosity.
Savage - Fierce, violent, or uncivilized in behavior; lacking in restraint or mercy.