How would you explain why there are such high levels of industrial pollution that are socially undesirable?

a) Industrial pollution is a negative externality- a side effect of industrial activities that corporations don't get penalized for

b) Industrial pollution is a positive externality- a side effect of industrial activities that corporations don't get rewarded for

c) There is more industrial pollution than socially desirable because the price of industrial products is higher than their equilibrium price

d) There is more industrial pollution than socially desirable because the price of industrial products is lower than their equilibrium price