Option 1 -> Correctly matches: Aid (help/assistance), Aide (person who assists), Aerial (existing in air), Abet (aid commission of offence).
Option 2 -> Incorrectly matches Aid with "existing in air" and Aide with "help or assistance" - these are reversed and wrong.
Option 3 -> Incorrectly matches Aid with "person who assists" and Abet with "help or assistance" - fundamental misunderstanding of the terms.
Option 4 -> Incorrectly matches Aide with "existing in air" and Aerial with "person who assists" - completely wrong pairing.
Hence, Option 1: (A) - (III), (B) - (I), (C) - (IV), (D) - (II) -> Aid is a noun meaning help/assistance; Aide is a noun referring to an assistant/helper; Aerial relates to air or atmosphere; Abet is a legal term meaning to encourage or assist in wrongdoing -> correct