Metamorphic rocks are formed from pre-existing rocks, undergoing a process known as metamorphism. This process occurs deep within the Earth`s crust due to high heat, pressure, and chemical reactions. Option 1, igneous rocks, are formed from the cooling and solidification of molten magma. While it is possible for metamorphic rocks to be derived from igneous rocks, this is not always the case. Option 2, sedimentary rocks, are formed from the accumulation and lithification of sediments. Similarly, metamorphic rocks can also originate from sedimentary rocks when they undergo metamorphism. Therefore, option 3 is the correct answer as both igneous and sedimentary rocks can give rise to metamorphic rocks. Option 4, "None of these," is incorrect as it contradicts the formation process of metamorphic rocks.