Difference between standing still and remaining calm

[Jo]

Test No. express/advan-12 "Splitting Hairs", question 1

We told him to keep his hair on because he was getting angrier and angrier.

(a) to stand still
(b) to remain calm
(c) to speak quietly
(d) to sit down

Test No. express/advan-12 "Splitting Hairs", answer 1

We told him to remain calm because he was getting angrier and angrier.

Correct answer: (b) to remain calm
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difference "stand still" and "remain calm"? Thanks, again.

[Torsten]

If you stand still you don't move. If you remain calm you are very relaxed inside and are not worried. So you might remain calm while you are moving around and you can stand still while you are not calm. Remaining calm and keeping cool are almost the same.
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