Final answer:
The answer that is not a problem commonly found when monitoring is that organizations collect data that are easily gathered.
Step-by-step explanation:
Out of the given options, the answer that is not a problem commonly found when monitoring is a. organizations collect data that are easily gathered. This is because monitoring often requires collecting data that are not easily gathered, such as subjective or qualitative data.
The other options, b. gathered data are not the most important to reach the organization's goals, c. there is an undue emphasis on measuring objective output performance, and d. inputs measurements are used as a proxy for output completion, are common problems that can arise when monitoring.