One who cannot be corrected

The correct answer is B. Incorrigible.

An incorrigible person is one who cannot be corrected or reformed. They are often stubborn, defiant, and unwilling to change their ways. Incorrigible people may be difficult to live

The other options are incorrect because:

• Incurable means that a disease or condition cannot be cured.
• Hardened means that someone has become tough or unfeeling.
• Invulnerable means that someone is not able to be harmed or injured.

I hope this helps!