What Was the Purpose of the McMahon Letter

What was the purpose of the McMahon Letter?

A) The British promised to help establish an Arab state in the region between Iraq and Egypt.
B) The British promised to prevent the establishment of a Jewish state.
C) The British promised to remain neutral in regard to the disposition of Ottoman land.
D) The British promised to help establish an Arab state only if the Arabs accepted a Jewish state.
E) The British promised the Zionists they would prevent the establishment of an Arab state.