Which of the Following Statements Concerning the Ability of Animals

Which of the following statements concerning the ability of animals to acquire language is false?

A) some language-like skills have been taught to a number of species
B) questions remain concerning whether the language-like behaviour of animals demonstrate all the critical properties of language
C) animals have never shown behaviour that suggests an understanding of grammatical rules
D) the ability to use language - in a very basic, primitive way - may not be entirely unique to humans