(a)decline in the American manufacturing industry
(b)France’s demand for repayment of America’s war debt
(c)rising inflation and unemployment
(d)decline in American imports from Britain
(e)rising trade imbalance with Britain
Well you can eliminate A, because it doesn't make since. you can eliminate B, because France was in debt to America. You can eliminate D, because although it contributed, it is not key. You can also eliminate E, because it's inaccurate.
So the answer is C. :)