Idiom: 'in one piece'

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Test No. incompl/inter-58 "Lots of Pieces", question 10

Eventually the police arrived and were pleased to see Charlie was still all right and in ......... piece.

(a) one
(b) fine
(c) good
(d) solid

Test No. incompl/inter-58 "Lots of Pieces", answer 10

Eventually the police arrived and were pleased to see Charlie was still all right and in one piece.

Correct answer: (a) one
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is it right to say in one piece? is my answer correct?

[Mister Micawber]

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Yes. In one piece means not seriously injured.
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Native English teacher at Mister Micawber's