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'h00; end endmodule