Correct Answer:
B. b. Vulnerable
Invincible means unconquerable, so its antonym is vulnerable, meaning susceptible to harm or attack. Supreme, secure, and guarded are not opposites, as they imply strength or protection.
Invincible means unconquerable, so its antonym is vulnerable, meaning susceptible to harm or attack. Supreme, secure, and guarded are not opposites, as they imply strength or protection.