Explanation:

Certainly, let's break down the paragraph and options:

- B: Introduces Ladakh as a cold desert with low rainfall. This sets the context.

- C: Expands on the context by discussing glaciers as a primary water source due to the lack of rainfall.

- A: Talks about water shortages in Leh and implies a problem.

- D: Provides a solution to the problem mentioned in A, crediting Chewang Norphel with the creation of artificial glaciers.

By putting the sentences in this order, we get a logical flow from context to problem to solution.

Let's review the options:

- Option 1 (CBDA): Missing the initial context, starts with glaciers.

- Option 2 (BCAD): Accurately follows a logical order from context to solution.

- Option 3 (DABC): Starts with a solution without any context or problem.

- Option 4 (BCDA): Ends abruptly without resolving the water issue.

Given this breakdown, Option 2 - BCAD is correct.