What is the relevant range? What role does the relevant-range concept play in explaining how costs behave? A. The relevant range is the band of normal activity level or volume in which there is a specific relationship bet as variable or fixed with respect to a particular relevant range. B. The relevant range is the band of normal activity level or volume in which there is a specific relationship betw described as direct or indirect with respect to a particular relevant range. C. The relevant range is the band of normal activity level or volume in which there is an abnormal relationship described as relevant or irrelevant with respect to a particular relevant range. D. The relevant range is the band of normal activity level or volume in which there is no relationship between th relevant or irrelevant with respect to a particular relevant range