Question

which piece of evidence did alfred wegeners original theory of continental drift have access to?
evidence of ancient tropical swamps in cold regions of north america
o reversing paleomagnetism in rocks on the ocean floor
o seafloor spreading at mid - ocean ridges
o a seafloor that was geologically active with earthquakes, volcanoes, and mountain chains

Explanation:

Alfred Wegener's original theory of continental drift (proposed in the early 20th century) used evidence such as the fit of the continents (like how South America and Africa seem to "fit" together), fossil distributions (similar fossils found on different continents), and geological evidence. The evidence of ancient tropical swamps (which would be indicated by coal deposits formed in such environments) in cold - region North America (like coal deposits in areas that are now not tropical) was available to Wegener.

Reversing paleomagnetism in rocks on the ocean floor, seafloor spreading at mid - ocean ridges, and a seabed that was geologically active with earthquakes, volcanoes, and mountain chains are all pieces of evidence that came later (in the mid - 20th century) with the development of the theory of plate tectonics.

Answer:

evidence of ancient tropical swamps in cold regions of North America