PONTIAC, Mich. — A jury has been selected in Oakland County Circuit Court for a first of its kind trial against the mother of the Oxford High School shooter. Opening statements will begin Thursday for a trial against Jennifer Crumbley, 45, who is being tried on four counts of involuntary manslaughter. The trial is expected to last three weeks. There are 17 jurors, five of whom will be alternates. The mostly White jury is made up of 10 women and seven men. Eleven of the jurors are parents and six are not. About half of the jurors’ parents kept guns in the house growing up, and about half curren…