The group is experiencing secondary tension. Hence, Option C is the correct statement.
<h3>What do you mean by secondary tension?</h3>
Secondary tension arises after groups have exceeded the forming level of institutional development and start to conflict over member roles, differing ideas, and persona conflicts. 
These tensions are generally evidenced with the aid of using much less reserved and much less well-mannered conduct than number one tensions.
The missing information in the question is:
Polarization
new consciousness
secondary tension
credentialing
Hence, The group is experiencing secondary tension. Hence, Option C is the correct statement.
Learn more about  secondary tension here:
brainly.com/question/13758845
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I would say that it's a plain, and more specifically the European Plain (from France to Russia). Central Europe is really quite  flat with only occasional mountain ranges. 
        
             
        
        
        
Having a reference allows all of the above given statements.
Answer: Option D
<u>Explanation:</u>
When some one has a reference for something, it allows the person to refer to the method in an explicit manner and also allows to refer to the method in an explicit manner. 
The reference can be used to take in to the considerations the variables and the other methods of the object related to the calling of that particular method. It can also be used to refer to the object also. All of these can be referred to when a reference is given.