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

A person is holding onto a motorcycle wearing roller blades and being dug along a street. A man is standing by a fountain of water. people

Choices: (I) are sitting and waiting on water bikes.. (II) are washing a car with a hose.. (III) are doing roller skating tricks.. (IV) rollerblade and fall over each other..
The answer is:
(III)