The ratio of elastic modulus of material A rod and materials $B$ rod is equal to $E\frac{A}{E}B=0\mathrm{.}25.$ Calculate the ratio of elongation in A rod and elongation in B rod $(?$LA$/?$LB$)$ if they have the same length and the same cross$-$sectional area and are subjected to the same force.

a$.0\mathrm{.}4$

b$.0\mathrm{.}2$

c$.0\mathrm{.}8$

d$.0\mathrm{.}1$