JEE Main Physics question

When a weight of 5 kg is suspended from a copper wire of length 30 m and diameter 0.5 mm, the length increases by 2.4 cm. If the diameter is doubled, the extension produced is

• (A)1.2 cm
• (B)0.6 cmCorrect
• (C)0.3 cm
• (D)0.15 cm