Assertion (A): After World War I, there was worldwide credit contraction and break down of the International system of exchange.
Reason (R): Many countries left the gold standard and followed devaluation of the currency.
(a) Both A and R are correct.
(b) A is correct but R is not the correct explanation.
(c) Both A and R are wrong.
(d) R is correct but it has no relevance to A.