Please answer the following question: Fact 1: Agasoline lawn mower converts gasoline into motion. Fact 2: Small engines, such as in lawn mowers, pollute at a high rate. Given the two facts above, answer the question "converting gasoline into motion cause what" with the following options: - Dehydration - elections - global debt - friction - dangerous - pollution - Firecrackers - traffic jams
A:
pollution