Directions: In following question, four statements are provided. These statements form a coherent paragraph when properly arranged. Select the alternative representing the proper and logical sequencing of these statements.

A. It is fairly soft. B. The acid comes from rainwater. C. The rock in such places is limestone. D. And can be dissolved by a weak acid also.

In this question, A statement speaks about 'fairly soft'. So, the next statement should be in relation to it. D statement correctly follows A. It is so soft that it can even be dissolved by weak acids. Now, the next statement should about acid. D introduces 'acid' and B tells the source of acid, so, DB is also the key. This means ADB sequence is the most logical one. Option (3) which has CADB is the answer.