What was the result of the 1940 redistribution of the Rocky Mountain riding?

A. It expanded to include the entire western edge of Alberta
B. It was abolished and split into several smaller ridings
C. It merged with Okotoks-High River to form a new riding
D. The north part merged with Cochrane to form Banff-Cochrane, and other areas were redistributed to Okotoks-High River and Pincher Creek
Answer: 