Need help on the ones I got wrong.

Use the information contained below 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. To compress from time period 16 to time 15, 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.) To compress from time period 15 to time 14, 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.) To compress from time period 15 to time 14 , 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 F G H Answer is complete and correct. What is the adjusted total cost at time period 14? To compress from time period 14 to time 13, 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 To compress from time period 14 to time 13 , 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 F G H Answer is complete but not entirely correct. What is the adjusted total cost at time period 13?$2,000 Answer is complete but not entirely correct