What does nutshell mean?

[Thameem]

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #518 "English Slang Idioms (102)", question 3

"Rodney, I know that you have your presentation planned out but we have less time than was originally allotted. Can you just hit the vital points or describe your plan in a .........?" Marcie said.

(a) summarized volume
(b) abridged version
(c) nutshell
(d) broad brushes

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #518 "English Slang Idioms (102)", answer 3

"Rodney, I know that you have your presentation planned out but we have less time than was originally allotted. Can you just hit the vital points or describe your plan in a nutshell?" Marcie said.

Correct answer: (c) nutshell

Your answer was: incorrect
"Rodney, I know that you have your presentation planned out but we have less time than was originally allotted. Can you just hit the vital points or describe your plan in a summarized volume?" Marcie said.
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why nutshell here? what does nutshell mean?

[Alan]

Hi,

The shell of a nut is small and so if you put something in a nutshell, you are explaining something clearly and succinctly.

Alan
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English as a Second Language
You can read my ESL story Present Simple

[Mister Micawber]

The idiom is IN A NUTSHELL. The shell of a nut is a very small container.
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Native English teacher at Mister Micawber's