Which kind of rock is the result of the slow cooling of magma underground? A. extrusive B. gabbro C. intrusive D. sedimentary

A. Extrusive because extrusive refers to the mode of igneous volcanic rock formation in which hot magma from inside the Earth flows out onto the surface as lava or explodes violently into the atmosphere to fall back as pyroclastics or tuff ... Examples of extrusive rocks include basalt, rhyolite, andesite, obsidian and pumice.

The answer is intrusive rocks