The Quantity of Information Suitable for the Required Activity

C.

The attribute that describes the quantity of information that is suitable for the required activity is "Appropriate amount of information." This means that the amount of information provided should be sufficient to support the activity but not excessive, so as not to overload the user with unnecessary information.

While relevance and completeness are important factors in determining the quality of information, they do not specifically address the issue of quantity. Relevant information is that which is directly related to the task at hand, while complete information provides all necessary details. However, both of these attributes can be present in excess, leading to information overload.

Ease of manipulation, on the other hand, refers to the ability to easily access and process information, but it does not directly address the quantity of information needed for a given activity.

Therefore, the key attribute for determining the appropriate amount of information is striking a balance between providing enough information to support the task without overwhelming the user with irrelevant or unnecessary data.