A Potential Disadvantage of Giving Grades in the Classroom Is

A potential disadvantage of giving grades in the classroom is that:

A) they are usually unrelated to a teacher's instructional objectives.
B) they are typically not correlated with students' success in college or a professional career.
C) they may focus students' attention on performance goals rather than mastery goals.
D) most students believe that their grades are poor reflections of what they have learned.