What is the next step for the program manager?

A program manager has a multiple-project program that is scheduled to be completed by year’s end. During the program delivery phases of the protects several mandatory changes are identified that would extend the program’s completion date

What is the next step for the program manager?
A . Apply resource leveling to ensure the program is completed on schedule
B. Update the schedule to reflect the extended completion date
C. Adjust working hours to ensure the program is completed on schedule
D. Submit a change request to extend the program schedule

Answer: D