Direction: The following sentence test your ability to recognize grammar and usage errors. Each sentence contains either a single error or nor 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 one underlined part that must be changed to make the sentence correct. If the sentence is correct, select choice. In choosing answers, follow the requirements of standard written English.

The pearls in (A) edible clams and oysters are usually (B) of poor (C) quality and have (D) not commercial worth.(E) No error