How do you plan to solve it?
module selector3( input [7:0] a, input [7:0] b, input [7:0] c, input [1:0] sel, output reg [7:0] y ); always @(*)begin if(sel == 2'b00) y = a; else if (sel == 2'b01) y = b; else if(sel == 2'b10) y =c; else y = 8'b00; end endmodule