Step 1: Arrange the four laws on a timeline, Wildlife Act 1972, Water Act 1974, Forest Act 1980, Environment Act 1986.
Step 2: The Environment Act, the newest, came after the Bhopal tragedy as an umbrella law.
Step 3: Match each Act in List-I to its year in List-II from this timeline.
Step 4: Correct match, (A)-(II), (B)-(I), (C)-(III), (D)-(IV).