Why is this always giving me the wrong answers

Which of the following statements does not describe the raccoon dog

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

Which soil layers comprise the topsoil? o horizon a horizon b horizon c horizon