What does 'figure out' mean here?

[Wang Yuanlin]

Test No. incompl/advan-17 "At the Computer", question 5

I have tried and tried again and again and no matter what I do it still shows 'error' - I just can't ......... what's wrong.

(a) look out
(b) check out
(c) figure out
(d) bring out

Test No. incompl/advan-17 "At the Computer", answer 5

I have tried and tried again and again and no matter what I do it still shows 'error' - I just can't figure out what's wrong.

Correct answer: (c) figure out

Your answer was: incorrect
I have tried and tried again and again and no matter what I do it still shows 'error' - I just can't check out what's wrong.
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What does 'figure out' mean here?

[Alan]

This means find the reason for/work out.
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English as a Second Language
You can read my ESL story Word Story: Jokes