The Correct Answer and Explanation is:
The correct answer is C. Zagros.
The Zagros Mountains are the only geographical feature listed that fits the description provided in the question. This extensive mountain range is the largest in Iran and Iraq, stretching for approximately 1,600 kilometers (about 990 miles) from the border region of eastern Turkey and northwestern Iran, continuing southeastward across western and southwestern Iran to the Strait of Hormuz.
The question correctly places these mountains in western Iran and highlights their location next to the Khuzestan Plain. The Khuzestan Plain is a significant, low-lying, and historically rich area in southwestern Iran. It is essentially the easternmost extension of the great Mesopotamian plain. The Zagros Mountains form a dramatic natural boundary along the northern and eastern edges of this plain. This geological relationship is fundamental to the region’s geography, climate, and history. The mountains rise steeply from the flatlands, creating a distinct physical and climatic barrier that separates the arid Iranian Plateau from the fertile plains of Mesopotamia.
The other options are geographically incorrect. The Tigris and Euphrates are the two major rivers that define Mesopotamia; they are river systems, not mountain ranges. While they are in the same broader region, they do not match the physical description. The Asir Mountains are another prominent mountain range, but they are located in southwestern Saudi Arabia, running parallel to the Red Sea coast, and are not situated in Iran. Therefore, the Zagros Mountains are the only choice that accurately corresponds to a mountain range in western Iran adjacent to the Khuzestan Plain.
