Concept:Red Fort is built with red sandstone (a sedimentary rock), while Taj Mahal is built with white marble (a metamorphic rock).Explanation:Red sandstone forms from compressed sand and mineral fragments—this is a sedimentary rock. White marble originates from limestone that recrystallizes under heat and pressure—this is a metamorphic rock. Thus, Red Fort uses sedimentary rock and Taj Mahal uses metamorphic rock.Answer:Option A: Red Fort is made of sedimentary rocks whereas the Taj Mahal is made of Metamorphic rocks.