enough money to live (with/by)

hirashin said:

Hello, native English speakers,

I have a question again. Would you help me.
Which would be correct, (a), (b) or (c)?
(a) They can't make enough money to live.
(b) They can't make enough money to live with.
(c) They can't make enough money to live by.

Thanks in advance.
Hirashin

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