What Factors Have Led to the Recent "Nuclear Renaissance

What factors have led to the recent "nuclear renaissance?"

A) uncertainty and increased expense of building conventional coal power plants.
B) technological advances in methods for disposing of nuclear waste.
C) creating additional nuclear capacity is a political priority in the Unites States.
D) the uncertainty and increased expense of building conventional coal power plants and the fact that creating additional nuclear capacity is a political priority in the Unites States
E) All of these.