Coefficient of contingency is given by

A. $$\frac{{\sqrt {{{\text{x}}^2}} }}{{{\text{N}} + {{\text{x}}^2}}}$$

B. $$\frac{{\sqrt {{{\text{x}}^2}} }}{{{\text{N}} + {{\text{x}}^3}}}$$

C. $$\frac{{{{\text{x}}^2}}}{{{{\text{N}}^2} + {{\text{x}}^2}}}$$

D. $$\frac{{{{\text{x}}^2}}}{{{\text{N}} + {{\text{x}}^2}}}$$

Answer: Option B