A.select p.prod_id，p.prod_name，b.box_loc from product p，storage_box b where p.prod_id =b.prod_id and prod_name=’WIDGET’；
B.select p.prod_id，p.prod_name，b.box_loc from product p，storage_box b where prod_name=’WIDGET’；
C.select p.prod_id，p.prod_name，b.box_loc from product p，storage_box b where p.stor_box_num =b.stor_box_num and prod_name=’WIDGET’；
D.select prod_id，prod_name，box_loc from product ，storage_box where stor_box_num =stor_box_num and prod_name=’WIDGET’；