All of the given options are reasons for revenue variances expect B.) A change in input prices.
Revenue variances can be described as the tools that is usually used in statistiucs which do help in the process of measurement of the difference between expected and actual sales.
It shpould be noted that the information that an be gotten from there can determine the success of an organization's selling activities , and some of the reasons for this tool are the change in product mix and change in selling price.
Therefore, option B is correct.
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