To build Stonehenge, bluestones weighing up to four tons were dragged. The bluestones were also floated. Which combines the two sentences by using a compound verb? A. To build Stonehenge, bluestones weighing up to four tons were dragged; they were also floated.

B. To build Stonehenge, bluestones weighing up to four tons were dragged, or they were floated.

C. To build Stonehenge, bluestones weighing up to four tons were dragged and floated.

D. To build Stonehenge, bluestones weighting up to four tons were dragged, and they were floated.​