Option 1 -> (A) - (III): Irony uses language signifying the opposite; (B) - (IV): Pun is play on words with double meanings; (C) - (II): Paradox is a self-contradictory yet true statement; (D) - (I): Euphemism is a gentler expression for unpleasant things.
Option 2 -> Incorrectly matches Irony with Paradox's definition and Pun with Euphemism's definition.
Option 3 -> Incorrectly matches Irony with Euphemism's definition and Pun with Irony's definition.
Option 4 -> Correctly matches A and B, but swaps the definitions of Paradox and Euphemism.
Hence, Option 1: (A) - (III), (B) - (IV), (C) - (II), (D) - (I) -> This correctly identifies that Irony uses opposite meaning for effect, Pun creates humor through double meanings, Paradox presents contradictions that are true, and Euphemism softens harsh realities -> correct