Mark the letter A, B, C or D on...

Câu hỏi: Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following question.
In most ______ developed countries, up to 50% of ______ population enters higher education at some time in their life.

A. the- a

B.  the-0

C.  0- the

D.  0-0