How Does One Find the Median Value in a Class

How does one find the median value in a class that has an even number of members?

A) There is no median value since only classes with an odd number of members have median values.
B) Average the two most central values.
C) Choose the lower of the two most central values.
D) Choose the higher of the two most central values.
E) Use the average of the entire class as the median value.