B is the correct answer.
An unfavourable fixed overhead volume variance can be due to all of the following except an increase in utility costs.
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What is utility costs?</h3>
Utilities costs are the price associated with using services including electricity, water, waste removal, heating, and sewage. Throughout the reporting period, expenses are incurred, calculated, and accrued for, or payments are made. The term "Utility Costs" refers to all fees, surcharges, and other expenses related to providing any utilities that are necessary for the Premises, the Premises, or the Improvements, including, but not limited to, heating, ventilation, and air conditioning costs, costs associated with providing gas, electricity, and other fuels or power sources to the Premises, and costs associated with providing water and sewage services to the Premises.
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