Consider a manufacturing firm whose total costs for a given accounting period include variable manufacturing costs, fixed manufacturing costs and fixed non-manufacturing costs. There are no variable non-manufacturing costs. There are no beginning or ending Work-in-process or Finished Goods inventories. The gross margin $ amount for this firm O A. Will be equal to its contribution margin $ amount B. Will be strictly greater than its contribution margin S amount OC. Will be strictly positive OD. Will be negative E. Will be strictly less than its contribution margin S amount