To account for

[Veki]

Test No. incompl/inter-11 "Accounts", question 10

However hard I try, I find it impossible to account ......... this missing sum of money.

(a) with
(b) to
(c) for
(d) by

Test No. incompl/inter-11 "Accounts", answer 10

However hard I try, I find it impossible to account for this missing sum of money.

Correct answer: (c) for

Your answer was: incorrect
However hard I try, I find it impossible to account with this missing sum of money.
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Sorry, but I still don't understand
I found in my dictionary that "account for" means "be responsible for"?!

Thank you

[Alan]

Here this means explain how the calculations have been made.
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English as a Second Language
You can read my ESL story Colour Idioms