Option 1 -> Incorrect matching: (A)-(IV) is wrong as "fouling one's nest" isn't about gift criticism.
Option 2 -> (A)-(III): Harming one's own nest = harming family/friends; (B)-(IV): Don't inspect a gift horse's teeth = don't criticize gifts; (C)-(I): Bad workman = blaming tools for incompetence; (D)-(II): Good intentions = can still act wrongly.
Option 3 -> Incorrect matching: (A)-(II) is wrong as "fouling nest" isn't about good intentions.
Option 4 -> Incorrect matching: Multiple mismatches including (A)-(I) and (B)-(III).
Hence, Option 2: (A) - (III), (B) - (IV), (C) - (I), (D) - (II) -> Each proverb correctly aligns with its traditional meaning: the "ill bird" proverb warns against betraying one's own; "gift horse" advises gratitude; "bad workman" criticizes excuse-making; and "road to hell" acknowledges that good intentions don't guarantee right actions -> correct