*please answer 13 and SHOW how you got the answer thanks!

Egon Spengler is planning a charity benefit gala for his Save the City" campaign. However, because one of his partners, Peter Venkman, has difficulty staying on task, the project is scheduled and they are running out of time. Egon has used project management principles to lay out the task relationships and he finds that if they follow the traditional schedule, as outlined below, they will not have enough time to get everything done before the weekend of the gala. Egon has created a list of tasks, their time requirements, and their relationships. He has also begun a network diagram, but needs to know what to do next. He knows that he needs to reduce the total time by four weeks. Description Activity Duration Crash (weeks) Time (weeks) Preceding Crashing Activity(ies) Cost/Week A 7 B 5 A 7 6 Determine gala theme Reserve portal location for gala Create Marketing Plan Ray Parker, Jr. to audition musical acts B $1,500 D 6 3 B $1100 E 6 4 Determine ticket sales method $1,000 F 7 4 $750 Purchase supplies, including Stay Puff marshmallows Pick musical act and sign G 4 3 D $250 contract H 4 2 Sell tickets in person E $500 I 5 4 Sell tickets online E $1250 Gala! HI,F,G E CHE 0-0 a. 13. What is the minimum completion time for the project after crashing (until no more crashing is possible)? 23 weeks b. 26 weeks 27 weeks c. d. 29 weeks