What does this phrase mean: "it's none of your business"?

[Slada]

Business Idiom in English, Intermediate level

ESL/EFL Test #52 "Business Expressions (1)", question 5

I would ask you kindly not to interfere with what I'm doing as in all honesty it's ......... of your business.

(a) no
(b) nothing
(c) none
(d) nor

Business Idiom in English, Intermediate level

ESL/EFL Test #52 "Business Expressions (1)", answer 5

I would ask you kindly not to interfere with what I'm doing as in all honesty it's none of your business.

Correct answer: (c) none

Your answer was: incorrect
I would ask you kindly not to interfere with what I'm doing as in all honesty it's no of your business.
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what is the difference between "none" and "no"?
thank you.

English Learner slada

[Alan]

Hi Slada,

Thanks for an interesting question. If you said That's no business of yours, you would be using the word as a so-called determiner - in other words it determines the extent of the noun business in a way like an adjective and means not any. When you say as in the sentence: That's none of your business, you are using it as a pronoun with the idea of not one thing.

Hope that helps.

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

[Saudavabimbim]

hi Alan, please clearly explain" none of your business"
So I have a short Conservation

A: This is Tess, she's from London. She's ....How Old are you?
Tess: None of your business, Ravi!
So It have what meaning in the case?

[Beeesneees]

Tess doesn't think her age has anything to dow ith Ravi. She think he is being quite ignorant to ask and is telling him very clearly that he won't be getting an answer.
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Cheers m' dears!