A cement manufacturer has supplied the following data: Tons of cement produced and sold 290,000 Sales revenue $ 994,000 Variable manufacturing expense $ 235,000 Fixed manufacturing expense $ 322,000 Variable selling and administrative expense $ 172,540 Fixed selling and administrative expense $ 96,000 Net operating income $ 168,460 The company's contribution margin ratio is closest to: Multiple Choice A. 59.0% B. 44.0% C. 67.6% D. 16.9%