Directions: In each of the following sentences, a sentence is given with certain words in bold. Choose the pair/s of such words which need to be interchanged so as to make the sentence grammatically correct and meaningful.

Catastrophic erosion (A) of ecosystems is being driven by harvesting (B) use of land and water, direct unsustainable (C) of species, climate change, pollution, and release (D) of alien plants and animals in new habitats.