The earth crust is made up of various types of rock. Which statement about the rocks given below is incorrect ?

• A. Sometimes the molten magma cools down deep inside the earth's crust. Ince they cool down slowly they form fine grains. Granite is an example. They are igneous rocks.
• B. Grinding stones used to prepare paste/powder of spices and grains are made of granite.
• C. The Red fort is made of sedimentary rocks.
• D. The Taj Mahal is made of metamorphic rocks.