One of the obstacles to the rapid replacement of nonrenewable energy sources with renewable energy ...

One of the obstacles to the rapid replacement of nonrenewable energy sources with renewable energy sources is ________.
A) the improvement in the infrastructure for using renewable energy sources
B) the lack of government and private financial support for the development of renewable energy sources
C) advancements in the technological development of renewable energy sources
D) the motivation of private industry to proactively develop renewable energy sources
E) a unified energy policy by the government that supports the development of alternative energy sources