Often,at the Beginning of a Semester,professors Are Encouraged or Directed

Multiple Choice

Often,at the beginning of a semester,professors are encouraged or directed to allow students to be added to a class after the course has started.For the university,the variable cost of adding another student to a class:

A) is the cost of the instructor.
B) is the cost of energy in the classroom.
C) is the cost of adding another administrator.
D) is the cost of expanding the parking lot.
E) is next to nothing.