If legalization reduced current narcotics enforcement costs by one-third to one-fourth, it might save $6 - $9 billion per year.

Based on that paragraph can we conclude that this sentence is true?
Drug legalisation can lead to an increase in illegal drug production due to the increase in public demand for supply

Select from the following. (a). Yes. (b). It's impossible to say. (c). No.
(b).