Final answer:
The present-held idea for dealing with radioactive waste involves storing it in a geologically stable site away from human habitation.
Step-by-step explanation:
The present-held idea for dealing with radioactive waste from nuclear power plants involves storing the waste in a geologically stable site away from human habitation (option D). The waste is typically in the form of spent nuclear fuel and is initially stored in specially designed pools of water to cool it and act as a radiation shield. Eventually, the spent fuel can also be stored in dry storage containers using special outdoor concrete or steel containers with air cooling.