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) clarify… substantial
• (B) mirror… minimal
• (C) synchronize … vestigial
• (D) temporize… analogous
• (E) interrupt… pernicious