The type of subordinate clause is an adjective clause.
        
             
        
        
        
Answer:
Stage
Explanation:
It is stage, because an auditorium has a stage, unlike the other choices which are unrelated to the meaning of an auditorium
 
        
                    
             
        
        
        
Answer is D. I speak not to disprove what Brutus spoke, / but here i am to speak what i know