You Need to Make a Change to the Task Flow

You need to make a change to the task flow, and when you select the active task flow set, you are not asked to make a copy. Why is this happening?

A) The password is only required when you first create the task flow set.
B) You do not need a password because you are the administrator.
C) The active task flow set has not been set as the default task flow set.
D) You forgot to create a password for the task flow set.