Effectiveness relates to:

All of the above

The correct answer is option 4- All of the above.

Option-1 Doing the right task
Option-2 Completing activities
Option-3 Achieving goals

Being effective or doing work effectively basically means finishing the given task. Effectiveness in management is concerned with doing the right task, completing activities and achieving goals. In other words, it is concerned with the end result. So, the correct ans is all of these.