Direction: The 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 (E). In choosing answers, follow the requirements of standard written English.

Two circles are (A) externally tangent when they (B) lie on (C) opposition sides of a line tangent to (D) both of them. (E) No error