Liberia.
It comes from the Latin word liber which means free and Liberia is a country in West Africa.
I think it may be B, a borrowed language. The others don't seem right.
the answer to the equation is 4/5
Ridge push is a process in which the unlifted ridge is thought to push the oceanic plate towards the subduction zone. Slab pull is a process where by the weight of a subducting plate help to pull the trailing lithosphere into subduction zone. Ridge lush is cause by the potential energy gradient from the high topography. Slab pull is caused by negative buoyancy of the subducting plate.
