Igneous rocks are formed from cooling molten rock.
• One of the three main kinds of rocks along with metamorphic and sedimentary rocks are the igneous rocks, and they comprise both extrusive and intrusive rocks.
• The formation of igneous rocks takes place when the molten rock cools and crystallizes, either when the melted rock is still within the crust, or at the volcanoes on the surface of the Earth.
• The igneous rocks can possess several kinds of compositions, based on the magma they cool from.
• The two prime categories of igneous rocks are intrusive and extrusive rocks.
Thus, the correct answer is option A, that is, igneous.
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