Given below are four sentences in jumbled order. Pick the option that gives their correct order.
A. In arid regions of Rajasthan, almost all houses traditionally had underground tanks.
B. They were connected to the sloping roof of the house through a pipe.
C. These could be as large as a big room.
D. Rainwater falling on the roofs would travel down the pipe and get stored in the tank.

Correct option is B

Explanation:
· Sentence A serves as the introductory sentence as it introduces the main topic: underground tanks in Rajasthan. It sets the context for the rest of the passage.
· Sentence C logically follows A because it provides additional information about the underground tanks, describing their size. This elaboration naturally extends from the introductory idea.
· Sentence B comes next because it explains how the tanks function by being connected to the roof through a pipe. It provides a technical detail necessary for understanding the water collection system.
· Sentence D concludes the passage by describing the final stage in the process—how rainwater moves through the pipe and gets stored in the tank. This completes the logical sequence of information.
Thus, the correct order is ACBD.