Final answer:
Mission essential tasks deficiencies lead to decreased operational effectiveness. They can negatively impact productivity and efficiency, highlighting the importance of each task being performed correctly within a mission-driven operation.
Step-by-step explanation:
The impact of Mission essential tasks deficiencies is C) Decreased operational effectiveness. If a mission-critical task is not carried out properly or overlooked, it can lead to failures in achieving the intended outcomes of an operation. This can manifest in various ways such as a reduction in the quality of service or product, delays in delivery, or even mission failure. For example, in a bureaucracy, the intended positive aspects like increased productivity and increased efficiency might be compromised when critical tasks are not addressed adequately. Furthermore, in a team setting, the positive effect of appearing to work better, known as the team halo effect, can be negated by such deficiencies, leading to a perception that is worse than the actual performance, thus affecting overall morale, satisfaction, and productivity.