Answer:
1.The assignor has completed a legal action.
Step-by-step explanation:
Since the question is not complete however there may be four options available in books.google.com
1.The assignor has completed a legal action.
2.The buyer can sue the assignee to disallow the illegal assignment.
3.The buyer can take legal action against the assignor.
4.The sale contract is nullified.
In this scenario option 1 is true i.e The assignor has completed a legal action.