Tasks B and D start after Task A is completed. Task C starts after Tasks B and D are completed. task E starts after Task D is completed. Task H starts after task B is completed. Task G starts after Tasks C and H are completed. Task F starts after Task E is completed.
Following are the durations of all tasks:

Which of the following tasks are on the critical path?

A. A, D, C, G
B. A, B, H, G
C. A, D, E, F
D. A, B, C, G