Option 1 -> Recalcitrance means stubborn resistance to authority, making it a synonym of defiance, not an antonym.
Option 2 -> Acquiescence means accepting or complying without protest, which is the opposite of defiance.
Option 3 -> Impudence means bold disrespect or insolence, similar in meaning to defiance.
Option 4 -> Stubborn means refusing to yield or change, which aligns with defiance rather than opposes it.
Hence, Option 2: acquiescence -> Defiance means bold resistance or open disobedience, while acquiescence means passive acceptance or agreement, making them perfect antonyms -> correct