Read this excerpt from "Types of Volcanoes."

Lava domes are the fourth kind of volcano. They can form near composite volcanoes or on their own. When underground pressure pushes magma toward the surface but there is not enough fluidity for the magma to burst free, a dome of slow-moving lava forms and cools above ground.

A. if the magma were being released under water
B. if the magma were able to flow more like a liquid
C. if the volcano were on flat ground instead of another volcano
D. if the volcano were to develop in a colder area of the Earth