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The word 'communicable' is an adjective that describes something that can be communicated to others, especially regarding a communicable disease that can be spread from person to person. Option A, 'communication', is a noun and is not the same as 'communicable'. Option B, 'contagious' is the correct answer; the word 'contagious' refers to a disease that can be spread from person to person. Option C, 'commutation', refers to manipulating the direction of flow of something, and is unrelated to the word 'communicable'. Option D, 'understandable' is also incorrect. The correct answer is option B.