Which of the following is the correct torsion equation?

A. $$\frac{{\text{M}}}{I} = \frac{\sigma }{{\text{y}}} = \frac{{\text{E}}}{{\text{R}}}$$

B. $$\frac{{\text{T}}}{{\text{J}}} = \frac{\tau }{{\text{R}}} = \frac{{{\text{C}}\theta }}{l}$$

C. $$\frac{{\text{M}}}{{\text{R}}} = \frac{{\text{T}}}{{\text{J}}} = \frac{{{\text{C}}\theta }}{l}$$

D. $$\frac{{\text{T}}}{l} = \frac{\tau }{{\text{J}}} = \frac{{\text{R}}}{{{\text{C}}\theta }}$$

Answer: Option B