Answer:
D. oil and natural gas fields
Explanation:
The Caspian is the largest inland sea on the planet. If until 1991 there were only two countries that had coast (Iran and the USSR), with the disappearance of the Soviet giant three new States (Kazakhstan, Turkmenistan and Azerbaijan) emerged as owners of rights over part of their waters and their natural resources. Located in the heart of Eurasia, in the Caspian Sea and its adjacent areas are some of the most important gas and oil reserves on the planet, which makes the Caucasus-Central Asia axis an area of high strategic value.
Over the past decade, both Kazakhstan, Turkmenistan and Azerbaijan have entered the scene as important players in the regional and global energy scene, thanks in particular to the discovery of new reserves of both gas and oil in the region, the increase in extraction volumes and the establishment of new export routes.
