Answer:
Option (c) is correct.
Step-by-step explanation:
There are two types of externality are as follows:
(a) Positive externality
(b) Negative externality
Negative externality occurs when a third person is affected by the engagement of two parties. It means that there is a reduction in the consumption function of the third person from the production of goods by the other parties.
In our case, a firm which produces paper and from this production of paper there is an emission of Dioxin which affect the consumption of nearest persons or firms.
Therefore, a paper producing firm have to consider all the externality while calculating the total cost.