Towed force can be given by

A. $$\frac{{{{\text{T}}_f}}}{{\text{W}}} = \left( {\frac{{1.21}}{{{{\text{C}}_{\text{n}}}}}} \right) + 0.04$$

B. $${{\text{T}}_f} = \left( {\frac{{1.21}}{{{{\text{C}}_{\text{n}}}}}} \right) + 0.04$$

C. $${{\text{T}}_f} = \left( {\frac{{1.21}}{{{{\text{C}}_{\text{n}}}}}} \right) + 0.046$$

D. $${{\text{T}}_f} = 1.24{\text{W}} + {\text{0}}{\text{.046}}$$

Answer: Option A