Which One of the Following Is the Best Example of Summative

Which one of the following is the best example of summative evaluation?

A) Ms.Vickery gives her social studies students a quiz at the end of a unit to determine how well they have learned the material in the unit.
B) Mr.Waters gives his history students a quiz at midterm to determine whether he needs to spend more time on certain aspects of the Constitution.
C) Ms.Yarborough gives her German students weekly exams to make sure they are keeping up with the material.
D) Mr.Zeller gives his science students a pretest before beginning a unit on water to determine how much they already know.