When Jack Takes a Class,he Saves All His Work for That

When Jack takes a class,he saves all his work for that class with the name of the course.What is most likely happening to his saved files?

A) Because he is using the same name,the computer knows that the files are different so it adds a number to the name.
B) Because he is using the same name,each time he saves he is overwriting his previous work.
C) Because he is using the same name,the second document is put on the Clipboard until he selects a new name.
D) Because he is using the same name,the computer creates a new folder and saves it there.