Answer:
The phrase that describes the best folders in outlook 2016 is:
An organizational container.
Explanation:
The reasons behind this answer are that in the first place the folder allows the user to group emails, contacts, tasks, or even a calendar. So, because this is not only for emails or files. It is an object that can group several types of things and create a new category. Instead of only applying for certain objects. Thus, it is an organizational container. Because the first the third, and the fourth option describe objects that can only group-specific objects instead of all of them. There is no flexibility in the rest of the answers.
More people adopt the technology during any period, leading to an increasing rate of adoption. So, yes
