Directions: The following question tests your ability to recognize grammar and usage errors. The sentence contains either a single error or no error at all. Select the underlined part that must be changed to make the sentence correct. If the sentence is correct, select choice (E). In choosing the answer, follow the requirements of standard written English.

Delivering (A) the mails (B) to small villages (C) in India was, once a (D) difficult, perilous and exciting job. (D) No error