Question

Soft iron is used to manufacture electromagnets because their : (A) coercive force is high (B) retentivity is high (C) area of hysteresis curve is large (D) magnetic saturation limit is high but retentivity and coercive force are small

Answer 1

Soft iron is used to manufacture electromagnets because their magnetic saturation limit is high but retentivity and coercive force are small .

Answer 2

Soft iron is used when the electromagnet is made for for temporary magnets. They act like a magnet as long as the current passes through them and demagnetized when the current flow stops. 
So soft iron is used due to its magnetic saturation limit is high but retentivity and coercive force are small