What Is True of the Relationship Between Cities and Lords

What is true of the relationship between cities and lords?

A) Lords largely treated towns the same way they did vassals and serfs.
B) Some lords sold liberties to the townspeople that they demanded.
C) Townspeople would overthrow lords in order to create the laws they wanted.
D) Lords provided protection for towns, which in turns gave a portion of trade earnings to the lord.
E) Townspeople willingly provided military obligations to their local lord.