The correct answer is B) 0.98 ton. To calculate the safe working load for a 3-1/2 inch manila line with a breaking stress of 4.9 tons, we need to apply a safety factor of 5. The safe working load is typically calculated by dividing the breaking stress by the safety factor. In this case, the breaking stress of 4.9 tons divided by the safety factor of 5 results in a safe working load of 0.98 ton. The other options are incorrect because: A) 0.82 ton is too low, as it does not account for the safety factor. C) 2.45 tons is too high, as it does not use the safety factor correctly. D) 12.25 tons is too high, as it does not take the safety factor into account.