A steel wire having a radius of 2.0 mm, carrying a load of 4 kg, is hanging from a ceiling. Given that g = 3.1 π ms-2, What will be the tensile stress that would be developed
(A) 6.2 × 106 N m-2
(B) 5.2 × 106 N m-2
(C) 3.1 × 106 N m-2
(D) 4.8 × 106 N m-2