【单选题】

If the contagious nature of yawning is a means of communication within groups of animals, possibly as a means to______behavior, yawning in humans is most likely ______and an evolutionarily ancient mechanism that has lost its significance.
A．(A) clarify… substantial

B．(B) mirror… minimal
C．(C) synchronize … vestigial
D．(D) temporize… analogous
E．(E) interrupt… pernicious