A. He ran past others, and he came in first place.
B. Circling the track.
C. Because there were many others running, he knew he had to do
his best.
D. John ran quickly.
Who was circling the track? There is a clear lack of information here. A good way to answer these is to imagine someone walking up to you and saying these things. Which one would confuse you?? That's most likely the incomplete sentence.
