Interril erosion is the function of particle detachment, rainfall intensity and field slope $($S$)$ and can be represented by the following equation: $-2-1-4-1$ Where, : the interrill detachment rate $($kg m s $)$ : the rate of interrill erodibility $($kg s m $)$ : the rainfall intensity $($m s $)$ i i i i D D K IS K I $=$ If the interril detachment rate is $0\mathrm{.}14$ kg m$-2$ s$-1,$ the rate of rill erodibility is $0\mathrm{.}10$ kg s m$-4$ and the slope factor is $0\mathrm{.}20$ m m$-1,$ the rainfall intensity is: $($A$)4\mathrm{.}50$ m s$-1($B$)7\mathrm{.}00$ m s$-1($C$)9\mathrm{.}50$ m s$-1($D$)6\mathrm{.}50$ m s$-1($E$)8\mathrm{.}00$ m s$-1($F$)$ None of the above is correct