In the following sentence, a part of the sentence is underlined. Below are given alternatives to the underlined part, which may improve the sentence. Choose the correct alternative. In case no improvement is needed, choose the option that indicates 'No improvement'.

While precipitation is increasing through the Himalayas, most of this moisture drops in the summer - except in Karakoram, where snow dominates the scene.

A. Increasing over the Himalayas

B. Increasing across the Himalayas

C. Increasing along the Himalayas

D. Increasing above the Himalayas