Why do religious differences often lead to conflict especially in the middle east

Because when it comes to religion, most people told that THEIR way is the right way. And that people who say otherwise are the sinners, or the fiends, heathens, whatever. In the middle-east, there is not huge exposure to other religions, because most people there are religious-radicals, their religion takes up their whole life. They are also told that their religion is the only correct way, and are sometimes told that others who think otherwise need to be terminated or persuaded to their own religion.
I hope this helped. :)

D. a conflict between her competing identities.

Currently, as of february 2016, an american traveling in france would be by the exchange rate. the weakness of the euro and the strength of the us dollar means that items in france cost less to an american than they otherwise would. of course, if this trend reverses and the us dollar weakens and the euro strengthens, such as was happening in early 2008, an american traveling in france would have an adverse experience because items would cost relatively more.