Question

euphemism = a word/phrase intended to soften an unpleasant, embarrassing, or harsh word/phrase. as your banker, i need to tell you that you have a \temporary negative cash flow.\ this euphemism means
the banker is telling you that you have plenty of money left in your account.
the banker is telling you that you are broke and probably have a negative balance on your account.
the banker is telling you that you dont have very much money left.

Explanation:

A euphemism "temporary negative cash flow" is a softer way to say a negative financial situation. "Broke and probably have a negative balance" matches the meaning of negative cash flow (spending more than available, leading to a negative balance), while the other options either misinterpret (plenty of money) or understate (not very much left, which is less severe than negative balance).

Answer:

the banker is telling you that you are broke and probably have a negative balance on your account.