Which One of the Following Is Consistent with the Textbook's

Which one of the following is consistent with the textbook's recommendation for taking improvement into account in assigning final class grades?

A) Comparing students' standardized achievement test scores obtained this year with their standardized achievement test scores obtained last year
B) Giving a pretest and a posttest for each unit of study, and using the difference between the two test scores
C) Giving one test midway through a unit and another at the end of the unit, and using the difference between the two test scores
D) Assigning greater weight to assessments conducted at the end of the semester or school year