Which simple sentence has a compound subject?

A.
They hope to volunteer at the zoo, the museum, or the state park.

B.
Two volunteer positions are available at the museum.

C.
The summer break begins on June 6.

D.
Anton, Chris, and Jacob plan to volunteer this summer

Question

Which simple sentence has a compound subject?  
 
 

 
 

  

  A. 
  They hope to volunteer at the zoo, the museum, or the state park.   
   

 
 

  

  B. 
  Two volunteer positions are available at the museum.   
   

 
 

  

  C. 
  The summer break begins on June 6.   
   

 
 

  

  D. 
  Anton, Chris, and Jacob plan to volunteer this summer

anonymous · Answer

I think it would be A or D but im not that familiar with compound subjects. All I know is that they are joined by the coordinating conjunction "and" or "or".