Effectiveness relates to:

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. Efficiency means doing the task correctly and with minimum cost.
So, the correct ans is all of these.