The correct option is C A-i, B-iv, C-ii, D-iii
Respiration in earthworm:
In earthworm, gases can diffuse in and out through moist and thin cuticle/ skin. Such kind of respiration is also known as cutaneous respiration.
Respiration in insects:
Insects like cockroaches have a network of tubes which is known as a tracheal system to transport atmospheric air within the body.
Respiration in fishes
Fishes use gills as respiratory organs. Their gills are bathed in water for the exchange of gases.
Respiration in birds/ reptiles:
Birds and reptiles are animals having specialized structures known as lungs. These are commonly known as vascular bags as they are well supplied with blood vessels for exchange of gases.