A steel wire is suspended vertically from a rigid support. When loaded with a weight in air, it extends bylₐ and when the weight is immersed completely in water, the extension is reduced to l. Then the relative density of material of the weight is
A. lₐ/l
B. lₐ/lₐ-l
C. l/lₐ
D. l/(lₐ-l)
