Meaning of "Out of the question"

Business Idiom in English, Intermediate level

ESL/EFL Test #96 [color=blue]“Letter of Complaint (3)”, question 9

I was informed that this was out of the

(a) problem
(b) concern
© question
(d) hand

Business Idiom in English, Intermediate level

ESL/EFL Test #96 [color=blue]“Letter of Complaint (3)”, answer 9

I was informed that this was out of the question

Correct answer: © question

Your answer was: [color=red]incorrect
I was informed that this was out of the hand
[size=200]_________________________[/size]

Please explain me the meaning of “Out of the question”. Thanks.
Hong

Out of the question means absolutely not up for discussion or consideration.