What is the primary difference between a magnetic bearing and a grid bearing?

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The important idea here is that different “norths” are used as the reference direction when measuring a bearing. A magnetic bearing is measured relative to magnetic north—the direction the compass points, which shifts with location and over time due to the Earth's magnetic field. A grid bearing, on the other hand, is measured relative to grid north—the direction of the map’s grid lines, which is fixed to the map projection and does not drift with magnetic changes. So the primary difference is which reference line you’re using: magnetic north versus grid north. If you ever need to convert between them, you’d apply the local magnetic declination (the angle between magnetic north and grid north). The other options mix up the reference directions or bring in unrelated ideas like units, which isn’t what distinguishes these bearings.