Choose the correct meaning of phrase/idiom from the given options.
Achilles’ heel
The given phrase means 'one fatal weakness in someone who is otehrwise strong.'
The phrase comes from Greek mythology, where Achilles' mother dipped him in a river to make him invincible. But, his heel was not dipped as she was holding it, which made the heel his weakness.
e.g. The man knew that his family was his Achilles' heel.
Therefore, the correct answer is option 2.