Usage of 'regarding'

[Daemon99]

Can someone please tell me if the following set of sentences are correct?

1 a) I want some help regarding a question.
b) I want some help with a question.
c) I want some help on a question.

2 a) I want some information regarding the requirements document.
b) I want some information on the requirements document.
c) I want some information about the requirements document.

3 a) Have you heard the news regarding the civil war?
b) Have you heard the news regarding the civil war?
c) Have you heard the news regarding the civil war?

4 a) Can you give me any suggestions regarding the interview?
b) Can you give me any suggestions on the interview?
c) Can you give me any suggestions about the interview?
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Non-native speaker of English
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I intend to live forever - so far, so good.

[Mister Micawber]

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All seem fine to me (including when I insert 'on' and 'about' in sentences 3b and 3c respectively).
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Native English teacher at Mister Micawber's