The correct matches are A-2, B-3, C-4, D-1.

Abingdon is Galapagos Islands became extinct due to their competitor species, i.e. goat.

Cuckoo and crow show brood parasitism cuckoo lays its egg in crow's nest for hatching.

The cattle egret and cattle is a classic example of commensalism. The egrets always forage close to where the cattle are grazing because the cattle as they move stir up the vegetation and insects came out which is eaten by egret.

Lion and deer show predation in which lion act as predator and deer is a prey species.