The <span>Alps mountains is the answer</span><span />
Even though it is slums we are talking about, and we know how terrible the conditions are, still there's always some surprises (negative ones unfortunately). Specifically in Mumbai, it is surprising that big portion of the people living in the slums do not have access to city services, they do not have enough water even thought the city itself is surrounded by water, more then half of the population of Mumbai lives in slums (around 55%), most of the residents do not have toilets and have to pay for public toilets...
The correct answer is C. Glacier
Explanation
In the image, you can see the water cycle, and there are four letters, A, in the part of the sea; B on the earth's surface; the C below the Earth's surface, and the D in the mountains. In the area where the D is, there are glaciers on the mountain peaks caused by the low temperatures in the area. In addition, a glacier is a mass of ice formed on the earth's surface by the accumulation of snow on mountain peaks, in Antarctica, the Arctic, and Greenland. Therefore, the correct answer is C. Glaciar.
Iran is the only country that I found that wasn’t Arab. Sorry...