Why were Cynognathus fossils were important to Wegener's theory?

A They were found on lands now separated by a wide ocean
B They were the oldest fossil found at the time.
C They were found on lands joined together today.
D They were discovered in Antarctica and Africa.
What did Alfred Wegener try to prove with fossil evidence?
A that Earth is almost 5 billion years old
B that Earth is round, not flat
C that Earth once had no continents
D that Earth's landmasses move over time