What is the difference between 'move' and 'disappear? And which means step aside?

[intel]

Test No. incompl/inter-19 "A Collision - Finish this Story", question 3

The best thing I suppose is to ask him ..........

(a) to disappear
(b) to vanish
(c) to move
(d) to depart

Test No. incompl/inter-19 "A Collision - Finish this Story", answer 3

The best thing I suppose is to ask him to move.

Correct answer: (c) to move

Your answer was: incorrect
The best thing I suppose is to ask him to disappear.
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Why do we have to use move but not disappear?

[Torsten]

In the previous sentence we learned that a person is standing in front of the speaker blocking his view. That's why the speaker simply wants that person to step aside.
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