Help Plz

The table below shows the complete project plan and includes all the activities with its immediate predecessor activity and time taken by each activity. ANSWER THE FOLLOWING QUESTION 9 Activity Activity Description Immediate predecessor Duration (weeks) 17 A B C Fini F G H 1 J K L M N Excavate Lay the foundation Put up the rough wall Put up the roof Install the exterior plumbing Install the interior plumbing Put up the exterior siding Do the exterior painting Do the electrical work Put up the wallboard Install the flooring Do the interior painting Install the exterior fixtures Install the interior fixtures B C E D E, G C FI J J H KL 2 4 10 6 4 5 7 9 7 8 4 5 2 6