yellow are my answers. Are they correct? i need help finding the slack. thank you

Roger Ginde is developing a program in supply chain management certification for managers. Ginde has listed a number of activities that must be completed before a training program of this nature could be conducted. The activities, immediate predecessors, and times appear in the accompanying table: b) The critical activities for the leadership training program development project are B. D. E-G c) The project length for the leadership training program development project = d) Slack time for each of the activities is