Answer:
Complex sentence
Explanation:
Complex sentence can be regarded as sentence which consist of an independent clause as well as one or more dependent clauses. 
An independent clause is able to 
 stand as a sentence and can stand alone while dependent clause cannot stand on it's own. The two clauses is been connected with subordinating conjunction such as because, how,
before.
 
        
             
        
        
        
The correct answer is:
On the other hand. 
"He looked forward to visiting with old friends. Greta, on the other hand, dreaded seeing her old boyfriend."
This phrase is showing Greta and Fred are having different feelings in that moment, creating a contrast between both of them.
 
        
             
        
        
        
Realms is the answer to your question.
        
                    
             
        
        
        
Written sentence has a formal style and tone.