A uniform wire has length ' $\mathrm{L}^{\prime}$ and weight ' $\mathrm{W}^{\prime}$. One end of the wire is attached rigidly to a point in the roof and weight ' $\mathrm{W}_{1}{ }^{\prime}$ is suspended from its lower end. If ' $\mathrm{A}^{\prime}$ is the cross-sectional area of the wire then the stress in the wire at a height $\frac{3 \mathrm{~L}}{4}$ from its lower end isA)$\frac{4 \mathrm{~W}_{1}+3 \mathrm{~W}}{4 \mathrm{~A}}$B)$\frac{3 \mathrm{~W}_{1}-4 \mathrm{~W}}{2 \mathrm{~A}}$C)$\frac{3 \mathrm{~W}_{1}+4 \mathrm{~W}}{2 \mathrm{~A}}$D)$\frac{4 \mathrm{~W}_{1}-3 \mathrm{~W}}{4 \mathrm{~A}}$