Which statement correctly defines a clade and a synapomorphy?

Which statement correctly defines a clade and a synapomorphy?

• A. A clade is a group consisting of a common ancestor and all its descendants; a synapomorphy is a derived shared trait that defines that clade.
• B. A clade is a group with a common ancestor but not all descendants; synapomorphy is a trait that is inherited from a distant ancestor.
• C. A clade is a geographic region; synapomorphy is a trait that diverges.
• D. A clade is any population that has evolved independently; synapomorphy is a random mutation.

Answer: (A)