The one reason why nationalism in arab countries spread in the Middle East during and after World War 1 was :
(C) Arabs in the region wanted to gain independence from the Turkish leaders of the Ottoman Empire.
The Ottoman Empire’s entry into the First World War in November 1914 provided the final spark for outright revolt.The British, through their control of Egypt and the port of Aden at the entrance to the Red Sea, were reasonably well informed about the unrest brewing in Ottoman Arabia.In fact, just before the war broke out, Sharif Hussein ibn Ali sent one of his sons, Emir Abdullah ibn Hussein, on a secret mission to Egypt to contact the British military commander-in-chief there, Lord Kitchener. What support, if any, could he expect from the British if he rebelled against his Ottoman overlords?The response was cautious and qualified, but not discouraging. When war came the British quickly positioned themselves as the principal backers of the Hashemite cause.