B. The continents on a map looked like they fit together.
A is the theory he proposed <em>after</em> making this observation
C and D would disprove his theory, not support it.
The answer is divergent boundary.
Divergent boundaries happen when two plates move apart from each other. Transform boundaries occur when two plates slide past each other. Stationary boundaries are when two plates are too weak to take over each other. Convergent boundaries are when two plates collide.
United state- North America-Canada
South America- Brazil- Honduras
Asia- India- Russia
Hope I did it right.