The exchange rates between the Australian dollar and the US dollar were as follows: Jun 11SAUS = $.83US Jul 11SAUS = $.79US Aug 1 1SAUS = $.73US Sep 11SAUS = $.71US This chart shows a O a. strengthening Australian Dollar which makes it less expensive for Americans to buy Australian goods o b. weakening Australian dollar which makes it more expensive for Americans to buy Australian goods oc. strengthening Australian dollar which makes it more expensive for Americans to buy Australian goods d. weakening Australian dollar which makes it less expensive for Americans to buy Australian godden