Option C is correct because the distribution of fossils in different continents was evidence used for the continental drift theory by Wegener, not for the concept of sea floor spreading. According to the context, the facts considered for sea floor spreading include: (i) volcanic eruptions along mid-oceanic ridges, (ii) age and magnetic properties of rocks on either side of mid-oceanic ridges showing normal polarity near the ridges, (iii) ocean crust rocks being much younger than continental rocks (nowhere more than 200 million years old), and (iv) thin sediments on the ocean floor. The context explicitly states that mapping of the ocean floor and palaeomagnetic studies provided information that was 'not available at the time Wegener put forth his concept of continental drift.' Thus, fossil distribution was part of continental drift theory, not sea floor spreading.