Power plants with the lowest operating costs tend to:

A) have the lowest fixed costs in terms of construction.
B) have the highest fixed costs in terms of construction.
C) operate on the smallest scale of energy production.
D) generate the cleanest energy.

Power plants with the highest fixed costs in terms of construction, such as nuclear or renewable energy plants, often have lower operating costs once they are up and running. This is because the ongoing costs of fuel and operation are relatively low compared to plants with lower construction costs but higher fuel costs, such as coal or natural gas plants.