题目选项分析

U.S. Environmental Advocate: The government must consider legislation banning deforestation in the Pacific Northwest states. This will reduce the amount of damage caused to wildlife in that region. After Canada introduced laws against that practice, there was a fourfold increase in population rates of many affected species.

What role do the bolded phrases play in the passage above?

【选项】The first phrase states the author's premise and the second phrase is the conclusion based on the premise.