I want accurate answer with proper explanation please upvote

Question 39 A simple CPM network has three activities, A, B, and C. A is an immediate predecessor of B and of C. B is an Not yet answered immediate predecessor of C. The activity durations are A = 4, B = 3, C = 8. Marked out of 1.00 P Flag question Select one: 9 a. The critical path is A-C, duration 12. 9 b. The network has no critical path. O c. The critical path is A-B-C, duration 15. O d. The critical path is A-B-C, duration 13.5Question 33 Activity Preceding Duration Time left 1:40:52 Not yet A 9 answered A 2 Marked out of A 12 1.00 A 5 B 6 P Flag_question A network consists of the following list. Times are given in weeks. B C, F D H G. I E. J How many critical paths are there? Select one: a. 2 critical paths O b. zero critical path O c. 3 critical paths O d. 1 critical pathQuestion 16 The critical path for the network activities shown below is Not yet answered Activity Duration Immediate Predecessors Marked out of A 1.00 B A P Flag question C 7 D 4 A F 5 B,C.D Select one: O a. A-B-D O b. A-B-C-D-E O c. A-D-E O d. C-E