In my JLPT workbook, there is this example question:
適当{てきとう}な語{ご}を選{えら}びなさい
この殺人{さつじん}事件{じけん}の裏{うら}には( )上{じょう}のトラブルがあるようだ。
A 金額{きんがく} B 大金{たいきん} C 金銭{きんせん} D 基金{ききん}
The answer is... (drum roll, please)... C, 金銭{きんせん}.
First, I'm a little vague on the meaning of 金銭{きんせん}. Seems to just mean "money", but how is it different from just saying 金{かね}?
More importantly, while it does fit as an answer, I don't clearly see why it's a better answer than B, 大金{たいきん} (can also be read おおがね), which means "a large amount of money".
To me it makes more sense that a large amount of money is more of a motive for murder than just money in general.
Why is 金銭{きんせん} a better answer than 大金{たいきん}?
Rough translation of the question:
Select the appropriate word
It appears that underneath this incident of murder there was some trouble with ( ).
A An amount of money B a large amount of money C money(?) D a fund