Respuesta :
A front is defined as a "boundary" that separates two masses of different air densities. I am not entirely sure, but I think the answers are either C or D, but I'm mostly convinced it's option D.
Answer: C) The physical boundary between two or more air gasses.
Explanation:
A weather front is a transitional zone between the two air masses. It forms a physical boundary between the two air masses that exhibit differences in the temperature, humidity and densities. It is responsible for bringing the change in the climatic condition of the region. The types of weather fronts are cold, warm, occluded and stationary.