What would happen if activities B and D each took 5 extra days to complete instead of the expected duration?

Learning Goal: I’m working on a management report and need an explanation and answer to help me learn.
Given the following information, answer the questions about this project:
Activity
Expected Duration
Predecessors
A
4 days
—
B
9 days
A
C
11 days
A
D
5 days
B
E
3 days
B
F
7 days
C
G
3 days
D, F
H
2 days
E, G
I
1 day
H
Draw the network as a Gantt chart.
What is the critical path? Which activities have slack time?
What would happen if activities B and D each took 5 extra days to complete instead of the expected duration? How would the critical path change?