Expression: carrying a bag under her arm

[Salman]

English Grammar Error, Intermediate level

ESL/EFL Test #22 "Gerunds and Idioms", question 9

No one had the least suspicion that she was a shoplifter but the detective noticed that she was carrying a bag below her arm full of stolen items.

(a) suspicion
(b) shoplifter
(c) below

English Grammar Error, Intermediate level

ESL/EFL Test #22 "Gerunds and Idioms", answer 9

No one had the least suspicion that she was a shoplifter but the detective noticed that she was carrying a bag under her arm full of stolen items.

Correct entry: under
The error was: (c) below
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is it possible that all the choices could be correct?

Salman

[Alan]

Hi,

Under often refers to a position that is to some extent hidden as here because she wants to hide the stolen items. Below suggests lower than, which wouldn't make sense in this sentence.

Alan
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