Option 1 -> meek means quiet, gentle, and submissive - the opposite of brash.
Option 2 -> arrogant means having an exaggerated sense of importance - similar to brash, not opposite.
Option 3 -> brazen means bold and shameless - a synonym of brash, not opposite.
Option 4 -> audacious means daring and impudent - similar to brash, not opposite.
Hence, Option 1: meek -> "Brash" describes someone who is overly bold, loud, and aggressive in manner, while "meek" describes someone who is gentle, humble, and submissive - making them perfect antonyms. The sentence implies his aggressive temperament drove friends away; a meek temperament would be the opposite quality. -> correct