What one of the following is not an intrusive igneous body?

An intrusive igneous body that is not characterized as such is a volcanic ash layer. While intrusive igneous bodies, like batholiths, sills, and dikes, form from magma that cools and solidifies beneath the Earth's surface, volcanic ash layers are formed from explosive volcanic eruptions and are deposited on the surface. Therefore, volcanic ash layers do not qualify as intrusive igneous bodies.