Correct Answer: Wise

Solution : The correct choice is the third option .

Ludicrous means something that is absurd, ridiculous, or laughably absurd. Its antonym, wise, denotes good judgement, sound decision-making, or being sensible.

The meanings of the other options are as follows:

• Ridiculous : It is similar in meaning to "ludicrous", referring to something deserving mockery or absurdity.
• Insane : It means pertaining to mental illness or extreme irrationality.
• Pathetic : It describes something or someone deserving pity or sympathy.

Therefore, the correct answer is wise.