B

Step 1: Understanding the properties of soft iron. Soft iron is a ferromagnetic material that exhibits low coercivity and is easily magnetized and demagnetized. This makes it useful in applications where magnetic fields vary frequently, such as in electrical machines.

Step 2: Analyzing hysteresis loss. Hysteresis loss is the energy lost in the form of heat due to the lagging of magnetic material's magnetization behind the applied magnetic field. Soft iron is designed to have low hysteresis loss, meaning it does not lose as much energy when alternating magnetic fields are applied.

Step 3: Evaluating permeability. Permeability is a measure of how easily a material can become magnetized, or how well it can conduct magnetic lines of force. Soft iron has high permeability, which enhances its effectiveness in creating strong magnetic fields when alternating currents are applied.

Conclusion: Given the properties of soft iron, it has low hysteresis loss and high permeability, making option B the correct answer.