The answer to this is letter D. The economies of scale should steer clear from duplicating each other especially if they can thrive on their own. Why duplicate when you can produce something that people will be able to appreciate?
There are always results that are stating that when you make an effort to do away with duplication, this is the time when you can make the best gains. Take note that companies would always need to make an effort in order to establish the reputation that they want to become appreciated by the different consumers.