The correct answer is B. Garke-garke. The question is asking which of the options is not a duplicative word. Duplicative words are words that repeat a syllable or a sequence of syllables, often to emphasize or intensify the meaning. Options A, C, D, and E are all examples of reduplicative words in Hausa, while option B, "Garke-garke", is not a valid word in Hausa. Therefore, the correct answer is B. Garke-garke.