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

People are walking up a hill with tubes. A woman is seen tubing downhill. a man

Available options:
 (1). is playing in the water.;
 (2). walks behind the camera.;
 (3). then demonstrates how to use a snow tube.;
 (4). is shown speaking to changes in how to do downhill.;
The answer is:
(3).