Question: Why might it be difficult to select control points when georeferencing a scanned historical map to a modern spatial dataset of the same area? a

Why might it be difficult to select control points when georeferencing a scanned historical map to a modern spatial dataset of the same area?
a. There are too many changes in elevation in the area.
b. There are no common objects because the area has changed so much.
c. The projection of the modern spatial dataset is out of date.
d. The extent of the modern spatial dataset is larger than the historical map.

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