Step 1: Clarifying the Inquiry.
The inquiry pertains to the facet of management concerned with executing appropriate tasks and attaining objectives.
Step 2: Evaluating the Choices.
- Effectiveness: Effectiveness is defined by the attainment of correct objectives and the completion of tasks that align with overall aims.
- Efficiency: Efficiency pertains to the optimal execution of tasks, but does not inherently guarantee that the correct tasks are being performed.
- Sustainability: This concept relates to ensuring long-term viability but does not directly address task completion and goal achievement.
- Quality: While significant, quality primarily concerns the standard of the outcome, not necessarily the achievement of objectives.
Step 3: Determining the Outcome.
Effectiveness is identified as the correct response, as it directly corresponds to the completion of the appropriate tasks and the realization of goals.
Final Determination: \[\boxed{\text{The correct answer is (1) Effectiveness.}}\]