In the following question, out of the given four alternatives, select the one which is opposite in meaning of the given word.
Penalise

Correct option is A

Penalise (verb) – to punish or subject to a penalty. Example: "The referee penalised the player for a foul."
Synonyms: punish, fine, discipline, sentence. Antonyms: legalise (correct answer), allow, permit, authorise.
Legalise (verb) – to make something lawful. Example: "The government decided to legalise online gaming."
Other
· Forbid means to prohibit or ban. (Not opposite to penalise.)
· Veto means to reject a decision or proposal. (Not opposite, but related.)
· Outlaw means to make something illegal. (Similar to penalise, not opposite.)