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 == 0) y = a; else if (sel == 1) y = b; else if (sel == 2) y = c; else y = 0; end endmodule