Waving their arms about

[Michaela]

Test No. incompl/inter-19 "A Collision - Finish this Story", question 7

There are a lot of people there in the car park and they're ..........

(a) sailing their arms about
(b) waving their arms about
(c) turning their arms about
(d) driving their arms about

Test No. incompl/inter-19 "A Collision - Finish this Story", answer 7

There are a lot of people there in the car park and they're waving their arms about.

Correct answer: (b) waving their arms about

Your answer was: correct
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Dear professors,

Aolthough my answer was correct I have nooooooo idea what does this sentence express.
Can you help, please?

[Torsten]

There was an accident (a car crash) in the car park so many are walking and waving their arms because they don't know what to do.
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