30 If each individual is not different from the next, humans would need neither speech nor action to make themselves understood. Signs to communicate identical needs would be enough. (A) If each individual is identical to the next, humans would not need speech or action to make themselves understood, though signs would not be enough to express needs. (B) If we are all identical, we would not need speech or action to make ourselves understood, and signs would communicate our needs. (C) If each individual is identical to the next, humans would not need speech or action—signs to communicate needs—to make themselves understood. (D) If each individual is identical to the next, neither action nor signs would be needed for people to understand each other.