Meaning of 'put her money where her mouth is'

[siz]

Test No. express/inter-8 "Money to burn", question 6

I think she should stop talking about it and put her money where her mouth is.

(a) give money for talking too much
(b) take money out of her mouth and be quiet
(c) give money for something she says she believes in
(d) give money for talking a lot about nothing

Test No. express/inter-8 "Money to burn", answer 6

I think she should stop talking about it and give money for something she says she believes in.

Correct answer: (c) give money for something she says she believes in
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what does the expression mean?

[Alan]

This expression means that if you SAY you will help with money, then you must give the money as promised.
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English as a Second Language
You can read my ESL story Guy Fawkes Night for You

[Rich7]

I know that's the literal meaning but couldn't it signify anything more abstract ? like for instance: "do as you preach" if you get me.

[Alan]

No, the expression practise what you preach or do as you say is different. This expression here has to indicate some kind of commitment or support and usually that's MONEY.
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English as a Foreign Language
You can read my EFL story Make or Do?

[Rich7]

OK then, thanks again for the clarification.....