38. Which of the following statements is correct?
(A) An aptitude test is a test meant to place a student into a particular level or section of alanguage curriculum or school.
(B) An achievement test is a test used to determine whether course objectives have been met—and appropriate knowledge and skills acquired—by the end of a given period ofinstruction.
(C) A placement test is a test that is not limited to any one course, curriculum, or single skill inthe language； rather it tests overall global ability.
(D) A diagnostic test is a test designed to measure capacity or general ability a priori to predictsuccess in that undertaking.