Please answer this question. You need to select 3 activities that can be crashed most effectively.

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Construction of a building is based on the following CPM network: Predecessor Normal Cost $ 100 Activity B D Successor B, C, D E F F G 80 B, A B C, D E, F, D Normal Time 6 8 2 3 5 5 6 Crash Time 2 2 1 2 3 1 2 40 80 80 60 120 Crash Cost $ 150 140 60 120 140 100 160 E F G G c. How much additional cost is needed to crash the project by one day? Additional cost to crash one day off the project. This can be accomplished most effectively by crashing any one of which three activities below? (You may select more than one answer. Single click the box with the question mark to produce a check mark for a correct answer and double click the box with the question mark to empty the box for a wrong answer.) OA 00 E F G