How do you plan to solve it?
module selector3( input [7:0] a, b, 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