Which statement best describes a shared ancestral trait and its usefulness in resolving relationships within a group?

Which statement best describes a shared ancestral trait and its usefulness in resolving relationships within a group?

• A. A trait present in the ancestor that defines a clade
• B. A trait present in the ancestor; it can be uninformative for resolving relationships within a group
• C. Arises independently in multiple lineages
• D. Unique to a single species

Answer: (B)