Directions: The under given sentence has been divided into four parts, one of which may contain an error. No sentence contains more than one error. Select the underlined part that must be changed to make the sentence correct. If the sentence is correct as given select (5) 'No error' as your answer.

(1) The more you block off the land, (2) more the functions of nature (3) are necessarily impaired, and we will (4) pay for this sooner or later. (5) No error.