Workflow Process Get Change ItemType

Good day all.  I have a Method to dynamically assign a drafter to the activity.  Currently I have to specify the ItemType of the change I am using for this method to work, meaning I would have to recreate the Method for each different kind of change ItemType I want to use this on.  How can I pull the associated change ItemType from the Workflow Process or Workflow Process Activity that the method is running from to make this a more generic method?  The Method is written in C#.  Thank you for your help.