Completion of an activity on CPM network diagram, is generally known

The correct answer is: A. Event

An event is a point in time that marks the completion of an activity. It is represented by a circle on a CPM network diagram.

A node is a point in time that marks the start or end of an activity. It is represented by a square on a CPM network diagram.

A connector is a line that connects two nodes. It represents the time it takes to complete an activity.

Therefore, the completion of an activity on a CPM network diagram is generally known as an event.