Option 1 -> Incorrectly matches "To fan the flames" with "To take seriously" and "To take to heart" with "In trouble".
Option 2 -> Correctly matches all idioms: "To face the music" means to accept consequences, "To fan the flames" means to incite people, "In the doldrums" means in trouble/stagnation, and "To take to heart" means to take seriously.
Option 3 -> Incorrectly matches "To face the music" with "to incite people" and "To take to heart" with "To accept the consequences".
Option 4 -> Incorrectly matches "To face the music" with "In trouble" and "In the doldrums" with "To accept the consequences".
Hence, Option 2: (A) - (II), (B) - (I), (C) - (IV), (D) - (III) -> This provides the accurate pairing where each idiom is matched with its conventional meaning in English usage -> correct