Which sentence is in the passive voice?

A.
Listen to the birds singing in the morning.

B.
Did you post the assignments on the board?

C.
An emergency meeting has been called for this afternoon.

D.
A small fire in the hearth warmed the room.

Question

Which sentence is in the passive voice?  
 
 

 
 

  

  A. 
  Listen to the birds singing in the morning.   
   

 
 

  

  B. 
  Did you post the assignments on the board?   
   

 
 

  

  C. 
  An emergency meeting has been called for this afternoon.   
   

 
 

  

  D. 
  A small fire in the hearth warmed the room.

anonymous · Answer

@Gir_lover_♥

anonymous · Answer

I believe that it's C. It definitely is not D because D is active as well as A.