The answer is either B or D. Letter A doesn't make sense and letter C isn't right either because you need rainfall to have fertile plains.
New crust typically forms from separating plates, so it would be A: divergent boundary.
The correct answer is B. She applied the reflection to the triangle first. & C. She changed the size of the triangle instead of just applying a translation.
I just took the assignment and i got it correct :D
China and Japan I hoped this helped :)