Step 1: Understanding the question.
The question focuses on the aspect of management that deals with doing the right tasks and achieving goals.
Step 2: Analyzing the options.
- Effectiveness: Effectiveness is about achieving the right goals and completing tasks that contribute to the objectives.
- Efficiency: Efficiency focuses on doing tasks in the best possible way, but it doesn’t always relate to the right tasks being done.
- Sustainability: This involves maintaining long-term success but is not specifically about completing tasks and achieving goals.
- Quality: While important, quality focuses more on the standard of output, not necessarily on achieving goals.
Step 3: Conclusion.
The correct answer is Effectiveness, as it relates directly to completing the right tasks and achieving goals.
Final Answer:
\[
\boxed{\text{The correct answer is (1) Effectiveness.}}
\]