Answer: Option (C) is correct
Here in this given comprehension, Carol profess that entry of new organization in market will further lead to reduction in prices. However, new tax introduced by authorities will therefore increase costs for organization in industry. Therefore, we could state that even though there are new firms entering, this does not necessarily mean prices will fall.
i.e. To reduce emissions, the government has recently introduced tax per mile driven on automobiles, if true, would weaken Carol's argument that competition will drive prices down