Which of the following statements about mountain ranges in the united states and canada is false? a. the piedmont region is the fall line between the appalachian mountains and the east coast of the us. b. the sierra nevada mountains and the cascades both follow the pacific coast. c. the rocky mountains are east of the appalachian mountains. d. the highest peaks in the rocky mountains are over 14,000 feet high. select the best answer from the choices provided. a b c d