Option 1 -> (A)-(III): "Bite the bullet" means to face/take on a difficult challenge; (B)-(IV): "Fly off the handle" means to lose one's temper suddenly; (C)-(I): "The ball is in your court" means the next move is yours; (D)-(II): "A drop in the ocean" means a very small amount compared to the need.
Option 2 -> Incorrectly matches "Bite the bullet" with decision-making and "Fly off the handle" with challenges.
Option 3 -> Incorrectly matches "Bite the bullet" with decision-making and "A drop in the ocean" with challenges.
Option 4 -> Incorrectly matches "Bite the bullet" with losing temper and "Fly off the handle" with decision-making.
Hence, Option 1: (A) - (III), (B) - (IV), (C) - (I), (D) - (II) -> All idioms are correctly matched: "Bite the bullet" = facing difficult challenges, "Fly off the handle" = sudden anger, "The ball is in your court" = your turn to decide/act, and "A drop in the ocean" = insignificant amount -> correct