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

A track athlete prepares himself to run. He runs quickly down the path. he

Options:
I. is then seen walking and then jumping into the sand at the end.;
II. runs pretty fast a this course.;
III. does a high jump in the sand.;
IV. then jumps into the air, and lands in a pit of sand.;
The answer is:
IV.