PLEASE HELP!!!

Use the following information to compress one-time unit per move using the least-cost method. Reduce the schedule until you reach the crash point of the network. For each move identify what activity(s) was crashed and the adjusted total cost. Note: The correct normal project duration, critical path, and total direct cost are provided. To compress from time period 12 to time 11 crash the following activity(s) (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 wronglanswer. Any boxes left with a question mark will be automatically graded as incorrect.) To compress from time period 12 to time 11 crash the following activity(s) (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. Any boxes left with a question mark will be automatically graded as incorrect.) A B C D E