What must be given to prove that δbij ~ δbdf?

On this graph, the top horizontal line represents a price floor set above equilibrium. a price floor set below equilibrium. a price ceiling set above equilibrium. a price ceiling set below equilibrium.

Drastic boundary changes can occur for all of the following reasons except for a. a shift in the way a river flows b. the collapse of a government system c. a conflict between two neighboring groups d. one country's decision to sell land to another country select the best answer from the choices provide

The earth's internal process which drives seafloor spreading is