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 discovered in antarctica and africa.

c) they were found on lands joined together today

d) they were the oldest fossil found at the time.

Cynognathus fossils were important to Wegner's theory because they were found on lands now separated by a wide ocean.

Explanation:

Wegner used the fossil of cynognathus as evidence to prove his continental drift hypothesis. Cynognathus are reptiles which lacked the swimming ability. These reptiles survived in the land before separation in live form along with other organisms surviving side by side.

Later due to certain natural phenomenon these reptiles died and the land got separated by a wide ocean. The fossils of cynognathus reptiles are now found in the lands that are separated by wide ocean.