Final answer:
The next weather system to affect Detroit is likely a cold front approaching from central Canada. A cold front is a boundary between a cooler air mass and a warmer one and can result in significant weather changes.
Step-by-step explanation:
The correct answer to the next weather system to affect Detroit which is a cold front approaching from central Canada is: a) Front.
A cold front is a leading edge of a cooler mass of air at the surface level, which replaces a warmer mass of air, leading to a drop in temperature. This movement often originates from central Canada and moves towards the southern regions, such as Detroit. As cold air moves in, it results in a sharp change in weather, potentially bringing rain, thunderstorms, or in wintertime, snow. Cold fronts are generally associated with atmospheric troughs but are more specific in terms of temperature change and are often associated with more dramatic weather changes when compared to troughs, lows, or highs.
Comparing this with the information provided, which states that a 'cold front' can cause a significant temperature drop, we can confirm the answer. Also, gas generally moves from an area of high pressure to an area of low pressure, reinforcing the concept of frontal systems causing significant weather events as they move and encounter different pressure systems.