Concept:Igneous rocks are formed when molten magma or lava cools and solidifies.Explanation:Basalt forms from cooled lava on the Earth's surface, making it an extrusive igneous rock.Dolomite and limestone are sedimentary rocks formed from mineral deposits and organic remains.Marble is a metamorphic rock produced when limestone undergoes heat and pressure.Therefore, the correct example of igneous rock among the options is basalt.Answer:A. Basalt