Study the following statements and identify the correct combinations of statements.

Statements:

(A) Stones used for civil engineering works are classified in three ways: Geological, Physical and Chemical classification. 

(B) Unstratified Rocks possess crystalline and compact grains. They cannot be split into thin slabs. Granite, trap, marble etc. are examples of this type of rock.

(C) Sedimentary rocks are formed by the deposition of products of weathering on the pre-existing rocks. All the products of weathering are ultimately carried away from their place of origin by the agents of transport. Such agents are frost, rain, wind, flowing water etc.