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.

Ecological economists have for years pointed to the extreme (A) harm that humanity as a whole is extracting (B) by modifying terrestrial, marine, and freshwater ecosystems to suit (C) immediate needs, such as raising agricultural and food output and courting (D) materials that aid ever-increasing consumption.