difference between slang language and slang idiom meaning

[Marika]

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #521 "English Slang Idioms (105)", question 10

He knew there was a lot more going on in the investigation than his superiors and even his partners were telling him. He had been a police officer for twenty years and it burned him up that new things were happening in the case and he was being kept out of the ..........

(a) circle
(b) society
(c) circuit
(d) loop

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #521 "English Slang Idioms (105)", answer 10

He knew there was a lot more going on in the investigation than his superiors and even his partners were telling him. He had been a police officer for twenty years and it burned him up that new things were happening in the case and he was being kept out of the loop.

Correct answer: (d) loop

Your answer was: incorrect
He knew there was a lot more going on in the investigation than his superiors and even his partners were telling him. He had been a police officer for twenty years and it burned him up that new things were happening in the case and he was being kept out of the society.
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sir i wanna ask, what the different between slang language and slang idiom meaning?

Marika

[Mister Micawber]

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No difference, I think, other than that which distinguishes idioms (groups of words whose meaning has changed from the sum of its individual words).
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Native English teacher at Mister Micawber's