Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.
The General Certificate of Secondary Education (GCSE) is (A) the name of (B) a set of English qualifications, generally (C) taking by secondary students (D) at the age of 15-16 in England.
A. the name
B. a set of
C. taking
D. at the age