I need help with question C

Reliable Garage is completing production of the J2000 kit car. The following data are available for the project: \begin{tabular}{ccc} \hline Activity & Activity Time (days) & Immediate Predecessor(s) \\ \hline A & 4 & - \\ B & 4 & A \\ C & 4 & B \\ D & 12 & C \\ E & 7 & C \\ F & 7 & C \\ G & 3 & F \\ H & 2 & D, E, G \\ \hline \end{tabular} b. Determine the project's critical path and duration. The critical path is and the project duration is day(s). (Enter your response as a whole number.) c. What is the slack for each activity