The correct answer is option 3: Sedimentary rocks.

Coal and petroleum are both fossil fuels that are formed from the remains of ancient plants and animals. These remains get buried under layers of sediment over millions of years, and heat and pressure cause the organic matter to undergo chemical changes, transforming it into coal and petroleum.

Sedimentary rocks are formed from layers of sediment that are deposited over time. These rocks are commonly found in areas such as riverbeds, lakes, and oceans. Sedimentary rocks, such as sandstone, limestone, and shale, are the primary rocks where coal and petroleum are found.

Option 1: Igneous rocks are formed from the solidification of molten magma or lava. They are not the primary rocks where coal and petroleum are found.

Option 2: Metamorphic rocks are formed from the transformation of pre-existing rocks due to heat and pressure. While some limited amounts of coal and petroleum may be found in metamorphic rocks, they are not the primary source of these fossil fuels.

Option 4: Metamorphic and sedimentary rocks are mentioned together, but the primary source of coal and petroleum is sedimentary rocks. Alert - correct answer should be option 3: Sedimentary.