Human Natural Languages Seem to Follow a Duality of Patterning

Human natural languages seem to follow a duality of patterning, meaning that

A) there is a direct translation for each idea from one language to another.
B) sounds have the capacity to represent a wide variety of syntactic options and meanings.
C) sounds combine into small meaningful units called morphemes, and those small units can combine into still larger phrases and sentences, conveying even more complex information.
D) we are all capable of learning any language, given the right environment for encoding.