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