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 case (sel) 2'b00: y = a; 2'b01: y = b; 2'b10: y = c; default: y = 8'h00; endcase end endmodule