I believe your selection is B.
Answer:
Mary must submit official paperwork related to the merger or name change to the DSO, ensuring her records are updated.
Explanation:
Since the firm has merged and changed its name from XYZ Corporation to ABCXYZ Inc, Mary needs to draft a formal notification to her DSO regarding this change and the merger.
The DSO will then amend her records with the University of the Cumberlands.