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. No sentence contains more than one error. The error, if there is one, is underlined and lettered. If the sentence contains an error, 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.

The Ostrich, a flightless bird (A) possessing fully developed wings (B) as well as legs, (C) but unable to fly because of its weight, (D) is the largest bird in the avian family. (E) No error