This is a test of commonsense with single/multi-choices. Complete the next sentence:

A man on stilts is playing the bag pipes on a street. a bus

pick from the following.
[I] speeds by the man on stilts.;
[II] pulls in front of them.;
[III] is pulling an old man on it.;
[IV] passes on the street behind the man.;
The answer is:
[IV]