Can you please help with questions C and D?

Environment Recycling, Inc. must clean up a large automobile tire dump under a state environmental cleanup contract. Suppose that some of the activities in the Environment Recycling, Inc. project can be crashed. The table below shows the crash times and costs associated with performing the activities at their original (normal) times and also for the crash times (all times are in weeks). Normal Normal Crash Crash Time Activity Predecessor(s) Time Cost Cost A 3 2 $770 $420 1,950 B B A 6 5 5 A 8 8 6 840 no 2,150 1,440 1,040 D 6 5 640 E B, C, D 8 7 2 2 1,700 800 F D 3 1,950 1,000 750 G D 5 4 600 520 . E 4 2 920 I F, G, H 2 1 700 850 a. Choose the correct network for the project. The correct network is network B, A. B. A D F A D F B E B E H H D. D. B b. Identify the critical path. The critical path is A-C-E-H-I C. What is the total project completion time? Round your answer to the nearest whole number. weeks d. What is the lowest cost solution if the state wants to complete the project three weeks early? Round your answer for the project duration to the nearest whole number and the answer for the total cost to the nearest dollar. The total cost of a(an) X -week project-completion schedule is $