The critical activity has A. Maximum float B. Minimum float C. Zero float D. None of these

The correct answer is C. Zero float.

A critical activity is an activity on a project schedule that has zero float. This means that if the activity takes longer than planned, it will delay the entire project.

Maximum float is the amount of time that an activity can be delayed without delaying the project. Minimum float is the amount of time that an activity must be completed before the next activity can begin.

None of these options is correct.