Certain Primate Vocalizations Have Been Found to Possess Structural Elements

Certain primate vocalizations have been found to possess structural elements similar to those observed in human language:

A) through the discovery of the potential use of affixation by species of arboreal monkey.
B) through the discovery that nonhuman primates continue to produce new sounds throughout the course of life.
C) through the discovery that all primate vocalizations are referential.
D) none of the above