Final answer:
Shared embryonic features between red pandas and raccoons, studied through comparative embryology, suggest a common ancestry. Such similarities in embryos imply that they may have evolved from a common evolutionary path, despite differences observed in their adult forms.
Step-by-step explanation:
The embryological evidence of red pandas and raccoons suggests a shared ancestry. Comparative embryology studies the similarities and differences in the embryos of different species to understand their evolutionary relationships. Although embryology can provide clues about common ancestors, it's important to note that the question presents multiple choice options without a definitive statement which makes providing a concrete answer difficult without additional context. However, based on the principles of comparative embryology, option B) Shared embryonic features suggest a common ancestry is generally the most supported notion as similarities in embryonic development can indicate a common evolutionary path. Furthermore, structures that appear in embryonic forms may disappear by adulthood, emphasizing the importance of embryological studies in tracing evolutionary history.