The correct answer is option A, a gorilla that uses sign language to express itself
Advanced mode of communication in animals is an instance when an animal uses any sort of communication medium (such as visual, auditory, Tactile and chemical) to express their feelings, message or any purposeful activity. Gorilla uses visual mode of communication that is through signs and postures to convey its feeling. Koko Gorilla in America is popularly known for its extraordinary mastered sign language and various sign combinations.
