Consider the following passage: “The increase in global temp…

Consider the following passage: “The increase in global temperatures over the past century has resulted in the melting of polar ice caps. This alarming trend underscores the urgent need for immediate action to mitigate climate change and its devastating consequences.”  The proposition “This alarming trend underscores the urgent need for immediate action to mitigate climate change and its devastating consequences” plays which of the following roles in the passage above?