You need to retain historical information for both completed and in-progress tasks but create a baseline that includes the newly-selected tasks

You are a project manager for an organization that uses Project Server 2013. You have the
appropriate permissions to set all baselines. Your project experiences a scope change, which
requires you to add tasks to the end of the schedule.
You need to retain historical information for both completed and in-progress tasks but create a
baseline that includes the newly-selected tasks.

You check out your schedule in Project Web App (PWA) for editing and select the newly-added tasks.
What should you do next?

A.
Set an interim plan.

B.
Use an unused baseline to set a new baseline.

C.
Clear the baseline and then set a baseline for the entire project.

D.
Set a baseline for only the selected tasks.