Answer:
C. Order of Importance.
Explanation:
The group of words First, Following, and Next integrate a hierarchy, which order members inside a group from the most important to the least important.
The word First is grouped with the member(s) of the highest priority in the hierarchy, while the rest of the members are accompanied with the words Following and Next as the members that come lighter in priority.
An example of a group organized by order of importance is a kingdom, where the King is the first member and has the highest priority in the group, while his subjects are next in rank.
