Please answer the following question: Fact 1: Cold fronts cause thunderstorms as they pass by. Fact 2: Fronts boundaries between air masses Fronts are boundaries between air masses . Given the two facts above, answer the question "Boundaries between air masses can cause" with the following options: - Dehydration - friction - rain or sun shine - permineralization - heat energy - Pollution - Movement - thunderstorms
A:
thunderstorms