Sociologists define a(n) as a larger, more specialized group in which members engage in more impersonal, goal-oriented relationships for a limited period of time.

Secondary Group  

Explanation:  

The secondary group is one of the type of large group in the sociology that helps in define the various types of goal oriented or the impersonal relationship.  

The main objective of the secondary group is to completing the given task by sharing the mutual purpose for accomplish the task and in this type of group the people are communicating less at personal level.  

According to the given question, the secondary group is one of the large cluster of the people in which the members are more engaging at impersonal level.  

Therefore, Secondary group is the correct answer.

i believe your answer is mountains.

it all depends on how long the hours are. i think they wouldn't approve of it. in my opinion.