Which answer is a correctly punctuated compound sentence? A. Stella's shoulder injury is very painful; the doctor thinks she may
need surgery. B. Stella's shoulder injury is very painful, the doctor thinks she may need surgery. C. Stella's shoulder injury is very painful the doctor thinks she may need surgery. D. Stella's shoulder injury is very painful and the doctor thinks she may need surgery.
The answer is D because a compound sentence doesn't have a comma or two simple sentences just put together. A compound sentence also doesn't have a semicolon. That eliminates all the choices but D.
