The work functions of three metals A,B and C are WA, WB and WC respectively. They are in the decreasing order. The correct graph between stopping potential V0 and frequency V of incident radiation is

Irrespective of the material used, the slope of each line should be same, options (3) and (4)are not possible since the graphs are not parallel Since, WA >WB > WC  V0A>V0B>V0CThus, the correct order is C,B,A(i) indicates V0A