(a) Sedimentary rocks
(b) Metamorphic rocks
(c) Basalt and traps
(d) Granite

Ans. (d) : Granite

Ans. (d) : Granite is a coarse-grained igneous rock composed mostly of quartz, feldspar and plagioclase. It is common in earth’s continental crust, where it is found in various kind of igneous intrusions. It has comparative strength usually 200 MPa. It’s specific gravity is in range of 2.65 to 2.75.