**Explanation:**

The driest station among the given options is Leh, which is located in the Ladakh region of Jammu and Kashmir. Here are the reasons why Leh is the driest station:

**1. Geographical Location:**
Leh is situated in the high-altitude region of the Himalayas, surrounded by mountains. This geography plays a significant role in making it the driest station among the given options.

**2. Rain Shadow Effect:**
The Ladakh region, including Leh, falls in the rain shadow area. When moist air from the Indian subcontinent moves towards the Himalayas, it gets lifted and cooled, leading to the formation of clouds and precipitation on the windward side. However, as the air descends on the leeward side, it becomes drier and warmer, resulting in less rainfall or even arid conditions. Leh is on the leeward side of the Himalayas, resulting in minimal precipitation.

**3. Cold Desert Climate:**
Leh experiences a cold desert climate, characterized by long, harsh winters and short summers. The average annual rainfall in Leh is only about 100 mm, which is significantly lower compared to other cities like Mumbai, Bengaluru, and Delhi.

**4. Remote Location:**
Leh is located in a remote area, far away from the influence of the Indian monsoon. The monsoon winds primarily affect the southern and central parts of India, bringing heavy rainfall. Due to its distance from these regions, Leh receives minimal rainfall.

**5. Topography:**
The topography of Leh is dominated by barren mountains and valleys, with very little vegetation. Lack of vegetation reduces the moisture content in the air, contributing to the aridity of the region.

Overall, the combination of Leh's geographical location, rain shadow effect, cold desert climate, remote location, and topography makes it the driest station among the given options.