The correct option is C callousness
The term "callousness" applies to persons who are cruel and insensitive towards others. Compassion means sympathetic pity and concern for the sufferings or misfortunes of others. Pity and cruelty are opposite traits. Hence, Option C is correct. Among the rest of the options, violence means behaviour involving physical force intended to hurt, damage, or kill someone or something, uncivility means lacking in courtesy : ill-mannered, impolite uncivil remarks, hardihood means boldness; daring. These do not express this antonym, hence incorrect.