Select the incorrect statement. A. A critical path always begins at the very first event. B. A critical path always terminates at the last event. C. Critical activities control the project duration. D. Critical activity is the one for which free float is zero.

The correct answer is A. A critical path always begins at the very first event.

A critical path is the sequence of activities in a project that determines the earliest possible project completion time. It is the longest path through the project network diagram, and it includes all the activities that must be completed on time in order to meet the project deadline.

Critical activities are those activities that are on the critical path. They have zero float, which means that any delay in these activities will delay the entire project.

A critical path does not always begin at the very first event. For example, if there are two or more paths that lead to the first event, then the critical path may start at one of the other events.

Similarly, a critical path does not always terminate at the last event. For example, if there are two or more paths that lead to the last event, then the critical path may terminate at one of the other events.

Critical activities control the project duration because they are the activities that must be completed on time in order to meet the project deadline. If any of these activities are delayed, the entire project will be delayed.

Therefore, the incorrect statement is A. A critical path always begins at the very first event.