Final answer:
Lead and mercury are industrial pollutants harmful to neurological health, and they are particularly dangerous for pregnant mothers due to the risk of prenatal exposure.
Step-by-step explanation:
The chemicals mentioned lead and mercury, are very harmful to neurological health and are considered environmental hazards. These toxic heavy metals often come from industrial pollutants and can accumulate in the human body through various exposure routes, posing significant health risks. In the case of pregnant mothers, such contaminants can pass through the placenta and affect the developing fetus, leading to potential neurological damage or birth defects. The most proper classification from the provided options for these chemicals would be Industrial pollutants (Option C), as they are typically produced as by-products of industrial and manufacturing processes and can contaminate the environment.