Which of the following equations as suggested by Colebrook and White gives the increase in roughness of a new surface (ε₀) with age/time (t) (where, ε = roughness of the surface after time't'. α = a co-efficient to be experimentally determined)?

• A. ε = ε₀ + α.t
• B. ε = ε₀ + α.t²
• C. ε = ε₀ + α.t³
• D. ε = ε₀ + α.t⁴