Option 1: (A) - (IV), (B) - (I), (C) - (II), (D) - (III) -> Abdicate means to give up a throne; Expurgate means to remove offensive content; Plagiarism is literary theft; Besiege means to surround to capture.
Option 2: (A) - (III), (B) - (II), (C) - (I), (D) - (IV) -> Incorrectly matches abdicate with surrounding a place and besiege with giving up office.
Option 3: (A) - (I), (B) - (IV), (C) - (III), (D) - (II) -> Incorrectly matches abdicate with removing offensive content and confuses all other definitions.
Option 4: (A) - (III), (B) - (II), (C) - (IV), (D) - (I) -> Incorrectly matches plagiarism with giving up office and besiege with removing content.
Hence, Option 1: (A) - (IV), (B) - (I), (C) - (II), (D) - (III) -> The correct matching pairs each vocabulary word with its precise definition: abdicate (renounce power/throne), expurgate (censor/remove offensive material), plagiarism (stealing others' work), and besiege (military encirclement) -> correct