Answer:
A Water and other natural resources
Step-by-step explanation:
For option D Sunni and Shia issues, Israel is majority Jewish population while Palestine is majority Sunni population, Shia population in this region is almost none existent
For option B Israel doesn't need funding it already receives billions of dollars from America and already has advance technology, Oil is also very little and not a big natural resource within the Palestinian region.
For option C the partitioning of the Ottoman empire after WW I was based off of political boundaries and it says "What issues besides political boundaries"
I think that it is most likely A considering Water is a major dispute between Israelis and Palestinians as an issue of water and fishing has always been an issue in Gaza as Israel has a naval and land blockade. the PA in the west bank also has issues with Israel over water and other natural resources.