Organization XYZ has been doing its projects through Scrum. After sprint 4, product owner left the company. New product owner joined the project in sprint 5. He requested for few changes in the user stories prioritization. As a scrum master what will you do?
a. Allow the product owner to make the changes
b. Guide him that prioritization was done by previous product owner and cannot be changed
c. Excalate the matter to higher management
d. Ask the team to continue working on previous priorities.