What type of rocks form when magma erupts from an undersea volcano? O A. Extrusive igneous rocks O B. Biogenic sedimentary rocks O C. Intrusive igneous rocks O D. Metamorphic rocks

Volcanic rocks and sediment that form from magma erupted into the air are called "volcaniclastics," and these are technically sedimentary rocks. Volcanic rocks are among the most common rock types on Earth's surface, particularly in the oceans. Answer is A

Because its lava, its immediately known as igneous, and because its above the crust (despite it being under water), I believe its choice A, from what I remember