Option 1 -> Incorrectly matches "Black and blue" with "Unpleasant fact" and mismatches other idioms.
Option 2 -> Correctly matches A and B, but wrongly pairs "Ball of fire" with "Unpleasant fact" instead of "Active and energetic".
Option 3 -> Incorrectly matches "Black and blue" with "Unpleasant fact" and swaps meanings of B and D.
Option 4 -> Correctly pairs: Black and blue (bruised appearance) = Full of bruises; Blow one's own trumpet (boast) = To praise oneself; Ball of fire (energetic person) = Active and energetic; Bitter pill to swallow (harsh reality) = Unpleasant fact to be accepted.
Hence, Option 4: (A) - (II), (B) - (III), (C) - (IV), (D) - (I) -> All four idioms are matched with their standard English meanings: "Black and blue" refers to visible bruising, "blow one's own trumpet" means self-praise, "ball of fire" describes energetic individuals, and "bitter pill to swallow" represents difficult truths. -> correct