Answer:
The correct answer is:
Overproduction of chemicals and underproduction of electric power. (a)
Step-by-step explanation:
The chemical-producing firm chose a less-expensive procedure of disposing its waste by dumping into the stream, rather than a more expensive method of burying its waste, this leads to a reduction in the variable costs of production, hence increasing the volume of production (overproduction). However, the power plant incurred an increased variable costs, when using the polluted water, leading to an underproduction because the costs that would normally have been used to increase production volume, is used to decontaminate the water source.