What Was the Importance of George-Louis Leclerc's Findings

What was the importance of George-Louis Leclerc's findings?

A) Most animals have not changed since their creation, and they still look the same and function in the same way as in their past.
B) Most animals have not changed since their creation, but some have evolved vestigial structures as new components.
C) Some animals must have changed since their creation, and their vestigial structures must have functioned in ancestral organisms.
D) Some animals must have not changed since their creation, and all their structures must have functioned in ancestral organisms too.