In chaos and in a shambles

[Guest]

Test No. incompl/advan-36 "Super Supermarkets", question 8

Protest meetings are held but invariably they end in a ......... because they are not organized properly.

(a) disgrace
(b) shambles
(c) chaos
(d) fall

Test No. incompl/advan-36 "Super Supermarkets", answer 8

Protest meetings are held but invariably they end in a shambles because they are not organized properly.

Correct answer: (b) shambles

Your answer was: incorrect
Protest meetings are held but invariably they end in a chaos because they are not organized properly.
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why isn't "chaos" good?

[Torsten]

It's either in chaos (without a) or in a shambles (with a).
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