Answer:
Correct answer is a. It provides great wealth to the region, but it is also a source of conflict in the region.
Explanation:
A is correct as this is one of the wealthiest regions in the world when it comes to production of oil, but many crisis and even wars erupted in this region because of the control of the oil fields. Even the countries outside this region, including United States participated in the conflict.
B is not correct because peninsula is still rich will oil.
C is not correct as it is still one of the main sources for the region.
D is of course not correct, because of the option A.
