What does it mean: "all ears"

[Elga]

English Idioms and Expressions, Elementary Level

ESL/EFL Test #10 "Funny Idioms", question 2

Yes, tell me about it. I'm all ears.

(a) listening carefully
(b) listening quietly
(c) listening quickly
(d) listening completely

English Idioms and Expressions, Elementary Level

ESL/EFL Test #10 "Funny Idioms", answer 2

Yes, tell me about it. I'm listening carefully.

Correct answer: (a) listening carefully
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what does it mean: "all ears"

Elga

[Alan]

Hi Elga,

This expression means that you are ready to listen and that you are very interested/curious to hear what the other person has to say.

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

[Hanif]

Hi Alan,

From what I've hear from many conversations in the movies, the "all ears" meaning that I read in correct context is "giving complete listening to a certain person or issue". You know it's like "giving my attention all out to it".
That's why "listening carefully" I'd say is incorrect answer, because 'listening carefully' is quite a different with 'listening completely'. I mean, 'listening carefully' means you pay attention by the detail maybe to certain point of the issue, but 'listening completely' means you pay the attention from A to Z of the issue, and it has the same meaning with 'all out'.

Please share your opinion.
Thanks