Using apologize + "about" or "for"

[Matweij]

English Idioms and Expressions, Advanced Level

ESL/EFL Test #10 "Cats, Dogs and Ducks", question 8

There is no need to apologize about your remarks as I can assure you it's like water off a duck's back to me.

(a) of some concern
(b) of a little concern
(c) of little concern
(d) of less concern

English Idioms and Expressions, Advanced Level

ESL/EFL Test #10 "Cats, Dogs and Ducks", answer 8

There is no need to apologize about your remarks as I can assure you it's of little concern to me.

Correct answer: (c) of little concern

Your answer was: incorrect
There is no need to apologize about your remarks as I can assure you it's of less concern to me.
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When do we use 'apologize' with 'about' and when with 'for'?

Matweij

[Alan]

Hi,,

There is a slight difference. Apologise for is more specific and about is more general.

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

[Schneehed]

I don't understand clearly, can you give some examples about the difference between them?