C. The regime changes of the Arab Spring were caused by division and frustrations with the region's political systems. This led to mass protests, uprisings, and ultimately resulted in the overthrow of authoritarian leaders in countries like Egypt, Tunisia, and Libya.
D. The rulers of various countries have used their power to eliminate term limits, which is a sign of a weak political system. For example, in Egypt, President Abdel Fattah el-Sisi extended his rule indefinitely through a constitutional amendment, consolidating power and weakening the democratic process.
Overall, the Middle East has seen significant divisions and changes in its political systems as a result of internal and external pressures, leading to both increased authoritarianism and calls for reform.