Step 1: Understanding the Concept:
Environmental calendar events are internationally recognized dates observed to promote ecological sustainability and conservation.
Step 2: Detailed Explanation:
Let us match the dates for each observance:
- (A) World Ocean Day: Observed globally on June 8 to raise awareness about the protection of marine ecosystems. This matches with (II).
- (B) World Environment Day: Celebrated on June 5 under the United Nations Environment Programme to foster global environmental protection. This matches with (III).
- (C) World Wetland Day: Observed on February 2, commemorating the signing of the Ramsar Convention. This matches with (IV).
- (D) World Water Day: Held on March 22 to advocate for the sustainable management of freshwater resources. This matches with (I).
This gives the matching sequence: (A)-(II), (B)-(III), (C)-(IV), (D)-(I).
Step 3: Final Answer:
The correct matching sequence is (A) - (II), (B) - (III), (C) - (IV), (D) - (I).