JEE Main Physics question

When a 4 kg mass is hung vertically on a light spring that obeys Hooke's law, the spring stretches by 2 cm. The work required to be done by an external agent in stretching this spring to 5 cm will be

• (A)4.9 J
• (B)2.45 JCorrect
• (C)0.495 J
• (D)0.245 J